Abdominal infections represent a serious medical condition that can range from simple inflammation within the digestive tract to severe, life-threatening complications requiring emergency treatment. These infections are the second most common cause of infectious deaths in intensive care units and can lead to serious conditions like sepsis if not treated promptly.

Abdominal pain is one of the most common reasons people seek medical care, yet most cases resolve on their own without serious intervention. Understanding where the pain occurs, what it feels like, and when to worry can help you know whether you need immediate care or can safely manage your symptoms at home.

Abdominal wall pain is often confused with pain from organs inside the abdomen, leading many patients through months of unnecessary tests and procedures before getting the right diagnosis and treatment.

ABO haemolytic disease of newborn is a blood disorder that occurs when a mother and baby have incompatible blood types from the ABO blood group system. Unlike other forms of this condition, it can affect a firstborn baby and typically causes milder symptoms than similar blood group disorders.

Threatened miscarriage describes vaginal bleeding and cramping during early pregnancy that may—or may not—lead to pregnancy loss. While these symptoms can be frightening, many pregnancies continue successfully, with about 60% reaching full term despite early bleeding.

Acarodermatitis refers to a group of skin conditions characterized by distinctive rashes that primarily affect the extremities and certain body areas, with causes ranging from genetic disorders to viral infections.

Acne is one of the most common skin conditions that affects millions of people worldwide, causing pimples, oily skin, and sometimes scarring that can impact both physical appearance and emotional well-being.

An acoustic neuroma is a noncancerous tumor that develops on the nerve connecting your inner ear to your brain, causing symptoms like hearing loss, ringing in the ears, and balance problems that often develop gradually over years.

Acquired antithrombin III deficiency is a condition where the body doesn’t have enough of a natural blood-thinning protein, putting people at higher risk for dangerous blood clots that can affect the legs, lungs, and other organs.

Acquired ATTR amyloidosis, also known as wild-type ATTR, is a protein disorder that develops with age and affects the heart and nervous system. Unlike hereditary forms, it is not passed down through families but occurs when normal transthyretin proteins produced by the liver become unstable, misfold, and form harmful deposits in the body’s organs.

Acquired haemophilia is a rare but potentially life-threatening bleeding disorder that can appear suddenly in people who have never had bleeding problems before. Unlike the inherited form of haemophilia, this condition develops when the body’s immune system mistakenly attacks its own clotting factors.

Acromegaly is a rare hormonal condition that develops when the body produces too much growth hormone, causing bones, organs, and tissues to grow in unusual ways. While the changes happen slowly over many years and can be difficult to notice at first, early diagnosis and proper treatment can help people with this condition live normal, healthy lives.

Actinic cheilitis is a precancerous condition affecting the lips, caused by years of sun exposure that creates rough, scaly patches — particularly on the lower lip. Without proper treatment and protection, this condition can transform into a serious form of skin cancer.

Actinic keratosis is a rough, scaly patch on sun-exposed skin that develops from years of ultraviolet exposure. While most patches are harmless, they represent precancerous changes that can potentially develop into skin cancer, making early detection and treatment important for your skin health.

Activated PI3 kinase delta syndrome is a rare inherited immune disorder that leaves people vulnerable to repeated infections and other serious health problems. First identified in 2013, this condition affects the immune system’s ability to fight bacteria and viruses, often leading to a complex pattern of symptoms that can vary widely from one person to another.

When your heart suddenly stops getting enough blood, every minute counts. Understanding what happens during an acute cardiac event and knowing how to respond can make the difference between life and death.

Acute coronary syndrome is a life-threatening emergency that occurs when blood flow to the heart suddenly decreases or stops completely. This umbrella term includes heart attacks and unstable angina, all of which require immediate medical attention to prevent permanent heart damage or death.

Acute graft versus host disease is a serious complication that can occur after a stem cell transplant, when the donated immune cells mistake the recipient’s body as a threat and begin to attack it. This condition typically appears within the first three months after transplant and affects thousands of patients each year.

Acute graft versus host disease affecting the intestine is a serious complication that can occur after receiving donated stem cells, where the donor’s immune cells attack the recipient’s digestive system, causing severe symptoms and requiring careful management.

Acute graft versus host disease of the liver is a serious complication that can occur after a stem cell or bone marrow transplant, when donor immune cells attack the recipient’s liver tissue, typically within the first 100 days after transplantation.

Acute graft versus host disease in skin is one of the most common complications after a bone marrow or stem cell transplant, where the donor’s immune cells mistakenly attack the recipient’s skin, often appearing as the first sign that something is wrong.

Acute haemorrhagic ulcerative colitis is a severe form of inflammatory bowel disease that causes bloody diarrhea, severe abdominal pain, and dangerous complications. Understanding this medical emergency can help patients recognize when urgent care is needed and what treatment options are available.

Acute hepatic failure is a rare but life-threatening condition where the liver rapidly loses its ability to function within days or weeks, leading to serious complications that can affect the entire body.

Acute HIV infection is the earliest and most critical stage of HIV, typically developing within 2 to 4 weeks after the virus enters your body. During this period, the virus multiplies rapidly and spreads throughout your system, often causing flu-like symptoms that can easily be mistaken for other common illnesses.

Acute kidney injury is a sudden loss of kidney function that can happen within hours or days. While this condition can be serious and even life-threatening without treatment, many people recover fully when the underlying cause is found and treated quickly.

Acute leukaemia is an aggressive cancer of the blood and bone marrow that develops quickly and requires immediate treatment. While it can be life-threatening, newer treatments are helping more people live longer, and in children with certain types, there is a good chance for a cure.

Acute lymphocytic leukemia is a fast-moving cancer of the blood and bone marrow that primarily affects white blood cells called lymphocytes. While it’s the most common cancer in children, adults can develop it too, and treatment approaches offer hope for many patients.

Relapsed acute lymphocytic leukemia refers to the return of this blood cancer after previous treatment. While most people with ALL initially go into remission, between 15 and 20 percent of children and about 60 percent of adults experience a relapse, requiring additional treatment approaches.

Acute myeloid leukaemia is a rapidly progressing blood cancer that affects the bone marrow, causing it to produce abnormal white blood cells that crowd out healthy blood cells, leading to serious complications if left untreated.

Achieving remission in acute myeloid leukemia marks a crucial turning point in treatment, but it’s not the end of the journey. Understanding what remission means, what comes next, and how to care for yourself during this phase is essential for the best possible outcomes.

When acute myeloid leukemia returns after treatment or doesn’t respond to initial therapy, patients face a challenging situation that requires additional treatment approaches. Understanding what happens during recurrence and knowing the available treatment options can help patients navigate this difficult phase of their cancer journey.

Refractory acute myeloid leukaemia is when the disease does not respond to initial treatment, a challenging situation that requires carefully tailored approaches to help patients achieve remission.

A heart attack is a medical emergency that happens when blood flow to part of the heart muscle suddenly stops, causing damage or death to heart cells. Every year, more than 800,000 people in the United States experience a heart attack, and time is critical—every minute without treatment means more heart tissue is at risk.

Acute on chronic liver failure is a serious medical condition where the liver suddenly stops working properly in people who already have long-term liver disease. This sudden breakdown can happen quickly and affects not only the liver but also other vital organs in the body, making it a life-threatening emergency.

Acute promyelocytic leukaemia is a rare blood cancer that was once rapidly fatal but has been transformed into one of the most curable forms of leukaemia through revolutionary treatment advances.

Acute respiratory distress syndrome (ARDS) is a life-threatening lung injury that causes fluid to build up in the tiny air sacs of your lungs, leading to dangerously low oxygen levels in your blood. This serious condition usually develops within hours to days after a major illness or injury, and requires immediate intensive care treatment.

Acute respiratory failure is a life-threatening condition where your lungs cannot get enough oxygen into your blood or cannot remove enough carbon dioxide from your body. It happens suddenly and requires immediate medical attention.

Addison’s disease is a rare but serious condition where your adrenal glands stop making enough vital hormones your body needs to function. Though it develops slowly and can be hard to spot at first, it’s manageable with daily medication and can allow you to live a normal life.

Adenocarcinoma is a type of cancer that begins in the glands lining your organs. It can affect many parts of your body, from your lungs and breasts to your stomach and colon, making it one of the most common forms of cancer people face today.

Adenocarcinoma gastric is the most common form of stomach cancer, accounting for 90% to 95% of all stomach cancers. It develops in the cells that line the innermost layer of the stomach and often goes unnoticed in early stages, making it one of the leading causes of cancer death worldwide.

Adenocarcinoma is the most common type of colon cancer, starting in the glands that line the inside of your large intestine. While it typically affects older adults, early detection through screening and advances in treatment have improved outcomes for many patients.

Adenocarcinoma of the pancreas is the most common type of pancreatic cancer, accounting for about 90% of cases. This disease often develops without early warning signs, making it difficult to detect until it has advanced. Understanding this cancer, its symptoms, and available treatments can help patients and their families navigate this challenging diagnosis.

Adenoid cystic carcinoma of the salivary gland is a rare and slow-growing cancer that can be challenging to diagnose and treat. While it has a good survival rate in the first five years, this cancer has a strong tendency to return even many years after treatment, making long-term monitoring essential.

Adenomatous polyposis coli is a rare, inherited condition that causes hundreds to thousands of growths called polyps to develop in the large intestine, creating a nearly certain risk of cancer by middle age if left untreated.

Adenomyosis is a condition where tissue that normally lines the inside of the uterus grows into the muscular wall of the uterus, causing symptoms like heavy periods, severe cramping, and pelvic pain that can significantly affect daily life.

Adenosquamous cell lung cancer is a rare and aggressive type of lung cancer that contains characteristics of both lung adenocarcinoma and squamous cell carcinoma. This uncommon cancer accounts for only a small percentage of all lung cancer cases but requires specialized attention due to its unique features and treatment challenges.

Recurrent adenosquamous cell lung cancer is a rare and aggressive form of lung cancer that comes back after treatment. Understanding this disease and the treatment options available can help patients and their families navigate their journey toward better health outcomes.

Adenosquamous cell lung cancer stage 0 is a very early form of a rare lung cancer that combines features of two different cancer types, found only in the top lining of the lung before it has spread anywhere else.

Adenosquamous carcinoma of the lung stage I is a rare and aggressive form of lung cancer that contains both glandular and squamous cell components. Though it represents only a small percentage of all lung cancers, early detection at stage I offers the best chance for successful treatment and long-term survival.

Adenosquamous cell lung cancer stage II is a rare and complex form of lung cancer that contains features of two different cancer types. While it has started to spread beyond the original tumor, it is still considered treatable, with surgery and chemotherapy offering meaningful benefits to many patients.

Stage III adenosquamous cell lung cancer is a rare and aggressive form of lung cancer that contains both adenocarcinoma and squamous cell carcinoma components. Though challenging to treat, advances in chemotherapy, targeted therapy, and immunotherapy offer hope for improving survival and quality of life.

Adenosquamous cell lung cancer stage IV is an advanced, rare form of lung cancer that has spread beyond its original location, presenting unique challenges for diagnosis and treatment. This disease combines features of two different cancer types and requires careful management to improve outcomes.

Adenoviruses are a group of common viruses that can cause infections ranging from mild cold-like symptoms to more serious illnesses, particularly in young children and people with weakened immune systems.

Adrenal insufficiency is a disorder where the adrenal glands cannot make enough of certain essential hormones that keep your body working properly. While this is a rare condition, with proper treatment most people can lead normal, active lives.

Adrenocortical carcinoma is a rare but aggressive cancer that develops in the outer layer of the adrenal glands, small organs that sit on top of your kidneys and produce vital hormones. Though it affects only about 1 or 2 people per million each year, this cancer can cause serious health problems by releasing excessive amounts of hormones or growing large enough to press on nearby organs.

Adrenogenital syndrome, also known as congenital adrenal hyperplasia, is a group of genetic disorders that affects the adrenal glands and their ability to produce vital hormones your body needs to function properly.

Adrenoleukodystrophy is a rare genetic condition that causes serious damage to the nervous system and hormone-producing glands. This inherited disorder affects mainly males and can cause rapid loss of abilities in childhood, though some forms develop more slowly in adulthood.

Adult T-cell leukemia/lymphoma is a rare cancer linked to a virus that can remain silent for decades before causing serious disease in a small number of infected individuals.

Adult T-cell leukemia/lymphoma (ATLL) is a rare and aggressive blood cancer linked to a viral infection. When the disease returns after treatment or does not respond to initial therapy, patients face particularly challenging circumstances that require specialized approaches and careful consideration of available options.

Adult T-cell lymphoma/leukaemia that stops responding to treatment poses one of the most challenging situations in blood cancer care, with patients facing limited options and urgent need for new therapeutic approaches.