Stimulating the vagus nerve has a variety of effects, depending on the specific function being affected. 

For example, stimulating the vagus nerve can:

• reduce heart rate and blood pressure. This can be beneficial for people with hypertension or cardiovascular disease.
• improves digestive function and reduces inflammation in the gut, which can be beneficial for people with gastrointestinal disorders.
• activate the body's immune system. This may be beneficial for people with autoimmune disorders or other conditions that involve immune system dysfunction. 

Vagus nerve stimulation activates the cholinergic anti-inflammatory pathway (CAP), which may be beneficial for people with pain and inflammatory disorders.

(Breit et al., 2018)