Your blood type may influence your risk for several health issues. According to *WebMD*, those with **type A blood** are more likely to get *stomach cancer*, possibly due to higher rates of *H. pylori* infections, which cause ulcers and inflammation.

**Ulcers** are more common in people with **type O blood**, while **blood clots (VTE)** and **strokes** are more likely in those with **types A, B, or AB**. The article notes, *“Your risk for a stroke goes up if you have blood type AB.”*

When it comes to **diabetes**, types **A and B** are more frequently affected by type 2, though the reason remains unclear.

In contrast, **type O** may offer some protection. *“Your risk of coronary heart disease tends to be lower,”* possibly due to lower cholesterol and clotting-related proteins.

Blood type may also impact:

* **Fertility**: Women with fewer healthy eggs were often **type O**.
* **Memory**: **AB blood** appeared more common in people with memory issues.
* **Stress**: **Type A** individuals naturally produce more cortisol.
* **Malaria resistance**: **Type O blood** may make it harder for the malaria parasite to attach to cells.