Aspirin sensitivity occurs in people who have potentially dangerous reactions when taking aspirin or other nonsteroidal anti-inflammatory drugs (NSAIDs). About 10 percent of adults with asthma have symptoms triggered by taking these drugs, according to the American Academy of Allergy, Asthma and Immunology. These asthma attacks are often severe, and in some cases can be life-threatening.

Other forms of sensitivity to aspirin also exist. Some people have severe reactions to aspirin that are similar to an allergic reaction. Symptoms typically include nasal discharge (rhinorrhea), swelling, nasal polyps and anaphylactic shock, which is a rare, life-threatening allergic reaction. Those who are allergic to aspirin are also likely to experience similar symptoms when taking other NSAIDs.

Aspirin and other NSAIDs can also cause stomach ulcers, increase the likelihood of skin bruises and bleeding, and harm the liver and kidneys in some people. Those with a history of reacting to aspirin should avoid all NSAIDs, including ibuprofen, naproxen and ketoprofen.

Sometimes, NSAIDs are found as ingredients in other medications used to treat colds and cough, pain, and fever. For this reason, it is important that patients with aspirin sensitivity consult a physician before taking any new drug.