Advil is a nonsteroidal anti-inflammatory drug (NSAID) that is used to relieve pain and reduce fever. However, it can cause stomach irritation as a side effect. The symptoms of Advil-induced stomach irritation can vary from mild to severe.

Some of the common symptoms of Advil-induced stomach irritation include abdominal pain, bloating, nausea, vomiting, and indigestion. In severe cases, it can cause gastrointestinal bleeding, which can lead to black or tarry stools, blood in vomit, or abdominal pain.

To reduce the risk of Advil-induced stomach irritation, it is recommended to take the medication with food or milk, avoid alcohol, and do not take more than the recommended dose. It is also advisable to talk to a healthcare provider before taking Advil if you have a history of stomach ulcers or bleeding, or if you are taking other medications that can increase the risk of stomach irritation.

In conclusion, Advil can cause stomach irritation as a side effect, and the symptoms can range from mild to severe. It is important to take the medication as directed and to talk to a healthcare provider if you experience any symptoms of stomach irritation.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.hss.edu/conditions_guidelines-reduce-side-effects-nsaids.asp
[3] https://www.goodrx.com/advil/advil-side-effects