The back of the angina does not hurt all the time, because the pain radiates to the back of the left shoulder in patients with angina, and this pain is relieved after stopping to rest, or after taking nitroglycerin. Each attack usually lasts about 3-5 minutes, and some patients can last up to 10-20 minutes, not more than half an hour. If the back pain is not considered angina pectoris, other diseases such as tumor, tuberculosis, ankylosing spondylitis, fracture, etc. should be excluded as causes of persistent back pain. In addition, there are some paroxysmal back pains, which need to exclude neck pain, myofasciitis, etc. In some cases, the pain is caused by muscle strain after carrying heavy loads or other causes. In the case of cholecystitis, the pain may also radiate to the back. Rheumatism and rheumatoid rheumatism can also have this type of symptom, so it needs to be identified.