Stomach pain after insulin injection before going to bed is usually related to physiological factors, drug allergy, nerve pain and other factors, which can be combined with the cause of the general treatment and drug therapy to relieve the symptoms. 1. Physiological factors: some patients may have fear before injecting insulin, or excessive worry or fear, so they may have stomach pain after injecting insulin. 2. Allergy to medication: If you are allergic to the medication of insulin, the anaphylactic reaction may cause stomach pain. It is recommended to consult a doctor in time. 3. Nerve pain: If you don’t pay attention to the way and method of injecting insulin and stimulate the nerves, it is easy to cause stomach pain. If the pain is strong, it is recommended to consult a doctor in time. There are many reasons for stomach pain after insulin injection before going to bed, and it may also be gastroenteritis, etc. You need to consult a doctor in time and accept the doctor’s treatment.