Disorders of the immune system can be characterized by skin rashes, joint pain, headaches, loss of appetite and fever. Immune system disorders are caused by factors such as excessive fatigue, alcoholism or allergens, which cause the immune system to lose its self-regulation and resistance. Common symptoms of immune system disorders are as follows: 1. Skin and mucous membrane symptoms: waxing and waning of the face, rashes, photosensitivity, hair loss, mouth ulcers and so on. 2. Joint and muscle symptoms: joint pain and swelling, muscle weakness and stiffness, etc. 3. Nervous system symptoms: headache, dizziness, memory loss, slow reaction, neurasthenia, insomnia, etc. 4. Digestive system symptoms: loss of appetite, indigestion, emaciation, etc. 5. Other: fever, fatigue, depression, low immunity, etc. Most of the immune system disorders in patients are caused by low immunity. Diet should be more appropriate protein-rich food, should be low-fat, low-sugar, low-cholesterol diet, eat more vitamin-rich vegetables and fruits. Normally, we should ensure a regular life and not be too tired. If symptoms of immune system disorders occur, you need to go to the hospital in time and follow the doctor’s instructions to receive standardized treatment.