When people are nervous or excited, the breathlessness and even hyperventilation can be caused. Pulmonary alveolis must constantly expand without moderate and necessary contraction. Therefore, mood swings can seriously endanger the human health and some diseases can be caused. 

First, many blains can be caused. When people are angry, a large amount of blood can be sent to the head, which can reduce the content of oxygen in the blood and increase the number of toxins. The toxins can stimulate the hair follicles to cause different kinds of inflammations around the hair follicles. Thus, blains can be caused. The aging of brain cells can also be accelerated. When the blood is sent to the brain, the pressure of brain blood vessels can be increased.

The angry sense can also stimulate the sympathetic nerves and directly act on the heart and blood vessels. The blood flow volume in the gastric and intestinal tracts can be decreased, gastric peristalsis can be slowed down and the appetite can be worsened. If the situation is rather serious, gastric ulcer can even be caused. People should often massage the stomach so as to alleviate the uncomfortable symptoms.

When a large amount of blood is sent to the brain, the blood supply for the heart will be decreased to cause myocardial ischemia. In order to maintain the normal activities for the body, the heart has to work twice as much, which can cause irregular heart beat. When people are angry, it is better for them to calm down quickly so as to reduce the serious results.

In addition, when people are angry, a kind of substance called "catecholamine" can be secreted by the human body. This kind of substance can act on the central nervous system to increase the blood sugar and enhance the decomposition ability of fatty acid, which can increase the toxins in the blood and liver cells. At this time, people should drink water, as water can accelerate the elimination of free fatty acid inside the human body so as to decrease the toxicity.

In fact, the immune system can also be affected. When people are angry, the brain will ask the body to produce a kind of corticosterone which is transformed from cholesterol. The excessive accumulation of corticosterone can hinder the normal operation of the immune cells and decrease the immunity. The endocrine system can also be affected to cause hyperthyreosis. Therefore, when people are very angry, they should close eyes and breathe deeply as far as possible.