My husband is a 47 yr old , overweight male. Four days ago he started with a stiff neck. It got worse three days ago. Yesterday he woke up with such bad pain in his left shoulder going down the back of his shoulder blade. Today it was extreme pain in the same area and moving down the arm. Should we be thinking heart?
Hello, Your symptoms are pointing towards possibility of nerve compression in the cervical spine with articular pain in left upper limb.  Neck stiffness can be due to muscle spasm.  Possibility of heart involvement is less likely. I WOULD LIKE to advise X-ray of cervical spine anteroposterior and lateral views to check for cervical lordosis. If it is lost muscle spasm is likely cause.  Treatment is muscle relaxant like relax Mr 8 mg twice a day for 5 days. Avoid using large and hard pillows. Soft cervical collar application also helps in pain relief. Tab regain x 75 mg one at bedtime for reducing pain in left upper limb. If this is not helping MRI for the cervical spine and visit to orthopedic surgeon is recommended.  Hope I have answered your query. Take care