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INFO: Full form for ASA is ArgininoSuccinic Acidemia in Medical category
ASA also has other full forms in other categories mentioned below.

Aspirin, also known as acetylsalicylic acid (ASA), is a medication used to reduce pain, fever, or inflammation. Specific inflammatory conditions which aspirin is used to treat include Kawasaki disease, pericarditis, and rheumatic fever.

Aspirin given shortly after a heart attack decreases the risk of death. Aspirin is also used long-term to help prevent further heart attacks, ischaemic strokes, and blood clots in people at high risk. For pain or fever, effects typically begin within 30 minutes. Aspirin is a nonsteroidal anti-inflammatory drug (NSAID) and works similarly to other NSAIDs but also suppresses the normal functioning of platelets. Aspirin, often used as an analgesic, anti-pyretic and non-steroidal anti-inflammatory drug (NSAID), is able to have an anti-platelet effect by inhibiting the COX activity in the platelet to prevent the production of thromboxane A2 which acts to bind platelets together during coagulation as well as cause vasoconstriction and bronchoconstriction.

Evidence suggests that aspirin as a chemoprotective agent may reduce overall cancer incidence and mortality in colorectal, esophageal, and gastric cancers, with smaller effects on prostate, breast, and lung cancer. A review of randomised control trials showed that doses between 75 and 300 mg daily reduced overall cancer incidence by 12% after three years and also demonstrated a 33% reduction in mortality and 25% reduction in the incidence of colorectal cancer with a median follow up of 18.3 years.

One common adverse effect is an upset stomach. More significant side effects include stomach ulcers, stomach bleeding, and worsening asthma. Bleeding risk is greater among those who are older, drink alcohol, take other NSAIDs, or are on other blood thinners. Aspirin is not recommended in the last part of pregnancy. It is not generally recommended in children with infections because of the risk of Reye syndrome. High doses may result in ringing in the ears.

A precursor to aspirin found in leaves from the willow tree (genus Salix) has been used for its health effects for at least 2,400 years. In 1853, chemist Charles Frédéric Gerhardt treated the medicine sodium salicylate with acetyl chloride to produce acetylsalicylic acid for the first time. For the next 50 years, other chemists established the chemical structure and devised more efficient production methods.: 69–75 

Aspirin is one of the most widely used medications globally, with an estimated 40,000 tonnes (44,000 tons) (50 to 120 billion pills) consumed each year. It is on the World Health Organization's List of Essential Medicines. It is available as a generic medication. In 2019, it was the 38th most commonly prescribed medication in the United States, with more than 18 million prescriptions.

Stokes–Adams syndrome or Adams–Stokes syndrome is a periodic fainting spell in which there is intermittent complete heart block or other high-grade arrhythmia that results in loss of spontaneous circulation and inadequate blood flow to the brain. Subsequently named after two Irish physicians, Robert Adams (1791–1875) and William Stokes (1804–1877), the first description of the syndrome is believed to have been published in 1717 by the Carniolan physician of Slovene descent Marko Gerbec. It is characterized by an abrupt decrease in cardiac output and loss of consciousness due to a transient arrhythmia; for example, bradycardia due to complete heart block.

Alcohol septal ablation (ASA) is a percutaneous, minimally invasive procedure performed by an interventional cardiologist to relieve symptoms and improve functional status in eligible patients with severely symptomatic hypertrophic cardiomyopathy (HCM) who meet strict clinical, anatomic and physiologic selection criteria. In carefully selected patients, when performed by an experienced interventional cardiologist, the procedure is successful in relieving symptoms in over 90% of patients.

Hypertrophic cardiomyopathy is a condition of the cardiac muscle which grows abnormally thick in the absence of a pathophysiologic cause such as hypertension (high blood pressure) or aortic valve disease. In a large subset of patients with hypertrophic obstructive cardiomyopathy, thickening of the heart muscle in a particular part of the interventricular septum causes obstruction to blood being ejected from the left ventricle.

Alcohol septal ablation is a cardiac catheterization technique designed to reduce the obstruction to blood being ejected from the heart. The technique creates a small controlled myocardial infarction, killing the area of heart muscle responsible for the obstruction, and eventually causing it to fibrose and become less thick.

INFO: Full form for ASA is Ambulance Service Association in Medical category
ASA also has other full forms in other categories mentioned below.

INFO: Full form for ASA is American Society of Andrology in Medical category
ASA also has other full forms in other categories mentioned below.

The American Surgical Association is the nation's oldest surgical organization.

INFO: Full form for ASA is Anterior Septal Artery in Medical category
ASA also has other full forms in other categories mentioned below.