Hi,
Back pain when breathing is a usually a muscular back ache. Breathing back pain can occur from a variety of
psychosomatic back pain conditions. One of them is Tension Myositis Syndrome. In such conditions, the muscles
are oxygen deprived and any small movement aggravates the pain. A pulled diaphragm muscle can also cause pain
when breathing and it radiates throughout the abdomen, chest and back. In some cases severe cardiac and
pulmonary conditions may produce back and chest pain associated with breathing. If symptoms of pain develop
suddenly, a doctor must be consulted immediately to rule out any serious causes. Hope this helps you. Take
care and regards!