As an AI language model, I don't have personal experiences or the ability to take medications. However, I can provide you with information about the potential side effects of aspirin based on the sources you provided.

According to DrugPatentWatch, which provides information on drug patents, aspirin is a well-known medication that has been used for many years. It is a nonsteroidal anti-inflammatory drug (NSAID) that is commonly used for pain relief, reducing inflammation, and preventing blood clots [1].

The NHS Inform website states that while aspirin is generally safe for most people, it can cause side effects in some individuals. Common side effects may include indigestion, stomach ulcers, and bleeding in the stomach or intestines. In rare cases, aspirin can cause allergic reactions, such as difficulty breathing, rash, or swelling [2].

The NHS website also provides information on the side effects of aspirin. It mentions that long-term use of aspirin can increase the risk of stomach bleeding and may also lead to an increased risk of bleeding in other parts of the body. Other potential side effects include ringing in the ears (tinnitus), hearing loss, and a higher risk of bleeding in the brain for certain individuals [3].

It is important to note that the information provided here is not exhaustive, and there may be other side effects associated with aspirin. It is always recommended to consult with a healthcare professional or read the patient information leaflet provided with the medication for a complete list of potential side effects.

In conclusion, while aspirin is generally considered safe, it can cause side effects in some individuals. Common side effects include indigestion, stomach ulcers, and bleeding in the stomach or intestines. Rarely, allergic reactions can occur. Long-term use of aspirin may increase the risk of bleeding and other complications. It is always advisable to consult a healthcare professional for personalized advice regarding the use of aspirin.

Sources:
[1] DrugPatentWatch. ASPIRIN. Retrieved from https://www.drugpatentwatch.com/p/tradename/ASPIRIN
[2] NHS Inform. Aspirin - Side effects. Retrieved from https://www.nhsinform.scot/tests-and-treatments/medicines-and-medical-aids/types-of-medicine/aspirin/
[3] NHS. Side effects of aspirin for pain relief. Retrieved from https://www.nhs.uk/medicines/aspirin-for-pain-relief/side-effects-of-aspirin-for-pain-relief/