Stabbing Pain Below Left Armpit, GI Symptoms, Family History: Possible Causes?

I understand your concern about the pain under your left armpit, especially given your family history and worry about heart issues. While I can't provide a diagnosis, I can share some general information.

In my experience, pain in this area can indeed be related to gas or other gastrointestinal issues. The stomach and parts of the large intestine are located in the upper left abdomen, and gas or inflammation in these areas can sometimes cause referred pain that's felt higher up, even near the armpit.

However, this location is also close to other structures like ribs, muscles, and lymph nodes. Possible causes could include:

• Gastric issues (like gas or ulcers)
• Muscular strain
• Costochondritis (inflammation of rib cartilage)
• Lymph node swelling

While heart-related pain is possible, it's less common to feel it only in this specific area.

Given your symptoms and family history, I strongly recommend seeing your primary care doctor. They can perform a physical exam, review your medical history, and order any necessary tests to determine the cause of your pain.

Remember, if you experience severe, persistent chest pain, shortness of breath, or other concerning symptoms, seek immediate medical attention.