Check at first the quality of your chair and the height. https://www.quora.com/What-is-the-standard-office-chair-height https://www.quora.com/What-is-the-standa

Check at first the quality of your chair and the height. https://www.quora.com/What-is-the-standard-office-chair-height https://www.quora.com/What-is-the-standard-office-chair-heig... if you have still the issue contact a doctor.