I've had lower back pain since 2 months ago. i've been to doctors and cyros. it feels like stretched muscles. can the pain be caused by my stomach?

If overweight: or obese these can cause lower back pain. Get both an orthopedic and a PT exam and evaluation. If weight is the issue, consult a nutritionist/dietician and hook up with a gym.

Potentially: Certain low back conditions such as degenerative disc disease can be aggravated by extra weight. Less commonly, stomach problems can also cause “back” pain, such as in a duodenal ulcer for example. Don’t hesitate to discuss the specifics of your case with your doctor.