Taking painkillers once in a while for menstrual pain causes little adverse reaction to the body. However, the following side effects can occur if pain medication is taken frequently: 1. digestive discomfort, which is one of the most common side effects of taking pain medication and can lead to peptic ulcers in severe cases. 2. drug dependence can occur, with each menstrual cramp requiring pain medication, and the required dose of medication gradually increasing until finally taking pain medication is ineffective. There are many causes of dysmenorrhea, the treatment can not rely entirely on pain medication, need to identify the cause, the symptomatic treatment, usually can use hot compresses, physical therapy, traditional Chinese medicine to assist in the treatment. During menstruation, pay attention to keep warm, do not eat cold food, drink more hot water, do not eat spicy and stimulating food, do not overwork.