Recognizing Anxiety: Symptoms, Signs, and Risk Factors
“If you repeatedly feel anxious and stressed, or if it lasts a long time, your body never gets the signal to return to normal functioning. That can weaken your immune system, leaving you more vulnerable to viral infections. According to Harvard Medical School, studies have shown an increased rate of anxiety and panic attacks in people with chronic respiratory disease (COPD). COPD patients with anxiety tend to be hospitalized more often. Prolonged stress may lead to a general feeling of ill health. Vaccines may be less effective in people with anxiety disorders.
Your excretory and digestive systems also suffer. According to Harvard Medical School, there may be a connection between anxiety disorders and the development of irritable bowel syndrome (IBS) after a bowel infection. IBS can cause vomiting, diarrhea, or constipation.
Source: http://www.healthline.com/health/anxiety/effects-on-body