Thank you for posting your query.
I have noted your symptoms, and they are suggestive of lower back problem.
The most common possibility is lumbar disc disease, where the disc (soft tissue located between the vertebral bodies) bulge out and press on the nerves arising from the lower back region. If the pinching of nerves is severe, the pain may radiate down the leg (sciatica); otherwise, the pain remains in the lower back.
Other possibility is spasm of lower back muscles. This occurs most often due to wring posture, being overweight, and weakness of lower back muscles.
Vitamin D deficiency should also be excluded.
Initial evaluation would consist of doing MRI scan of lumbo-sacral spine.
Dr. Sudhir Kumar MD (Medicine), DM (Neurology)
Senior Consultant Neurologist