I am 28 years old women. I have pain in left arm and upper back and also in chest. But the pain comes once in a while and it last upto 1 hour maximum and the pain goes. The doctor I consulted says it may be due to calcium and vitamin d deficiency. I use computers 7 to 8 hours daily. The pain occur mostly while laying on the bed. When I sit on the bed the pain reduced. What can be the reasons of my pain?