Patients with Myofascial Pain Syndrome usually report regionalized aching, and diffuse, persistent pain in certain muscles and joints. 

The pain intensity can vary from mild to severe and is usually related to muscle activity. Symptoms may begin after trauma or injury to the affected area or can be of gradual onset. 

The most commonly affected areas are the muscles in the neck and shoulders (ie, trapezius, scalene, and sternocleidomastoid muscles) and pelvic girdle.Associated autonomic phenomena such as sweating, abnormal tearing, abnormal salivation, increased vasomotor response, and increased pilomotor response, can also potentially occur in extreme cases of Myofascial Pain Syndrome. 

It is believed that an autonomic phenomenon is a result of multiple sensitive nociceptors located in the region of trigger points. Other associated neurologic symptoms include paresthesias, numbness, blurred vision, trembling, dizziness, and tinnitus, Gastritis and Gastroparesis.

If persists for long this pain can also precipitate Secondary Hypertension, Diabetes Mellitus type - II, Obesity and Hypothyroidism.

So try to manage your myofascial pain early and don't allow this pain to persists for long as this can leads to the developments of any of above mentioned symptoms.