left arm pain

I am having pain in my upper left arm.  I'm 37. I had it this morning. It lasted about five minutes. it came on suddenly. it just happened again and has lasted about thirty minutes. It's my only symptom. But the pain is really bad. I've just had allergy testing done this afternoon. They checked my blood pressure and it was perfect, it always is. Can you tell me what this might be?

[Dr_Veena]

Hi,
     Left upper arm pain could be due to direct injuries, biceps tendinitis, over use injuries etc.
Severe pain radiating down the left arm is a classic sign of heart attack. It can be accompanied by nausea, shortness of breath or chest pain, but sometimes pain in the left arm is the only symptom. You need to see a physician for examination, blood work and EKG for further confirmation on this. Best.