2. Aspirin

For many years aspirin is recommended to relieve a large variety of ailments and conditions such as high blood pressure, headaches and even preventing heart attacks, dementia and cancer.
It is now found that while aspirin reduces the risk of heart attack, it does increase the risk of major bleeding. Aspirin is an acetylsalicylic acid, which can damage gastric walls and prolong bleeding. If you are at risk of gastrointestinal bleeding, ulcers, ulcerative colitis, or stroke, you should not take aspirin as a form of pain relief.
Prolonged use of aspirin may lead to anemia.