Can tight neck cause jaw tightness and fatigue?

Hello,

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Muscular strain can definitely be the cause of your symptoms. But there could be other factors too causing fatigue, such as low vitamin d3 levels, thyroid hormone imbalance, vitamin deficiency. Do you do a lot of work indoors, or do you have less exposure to sunlight? Do you have a feeling of numbness or tingling sensation soon after you have worked for a while? Is there any history of diabetes or hypertension, or thyroid issues in your family? Is there any history of morning stiffness or pain in your small joints of hands? Revert with the information so that I can guide you further. As of now, use ice packs, avoid bending forwards, have posture control, and do isometric back and neck strengthening exercises. You can take a short course of muscle relaxants like Cyclobenzaprine or Thiocolchicoside as prescribed by your local doctor for five days. Other investigations and medications can be advised as per your reply to the questions mentioned above. Regards.