Do herbs have side effects?

Chinese herbs very seldom have unwanted side effects, however, they often have positive ones. For example: a patient who came in for treatment of low back pain and received acupuncture and herbs came back after two weeks and reported that her chronic asthma had "miraculously" disappeared. The reason for this is that according to her diagnosis the cause of the back pain was that her Kidney Qi (energy) was deficient. This was also the cause of the patient's asthma. When the Kidneys were strengthened the asthma naturally went away.
Like western medications, Chinese herbs can dispel pathogens from the body and relieve symptoms. However, they also nourish and regulate the Qi, blood, body fluids and the internal organs to alleviate the root cause of the disease.