Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain it seems that you are suffering from Trismus also known as Lock jaw and it is a symptoms of some underlying disease or problem and is not a disease on its own.. It can occur due to a number of causes like traumatic injury to the jaw joint, jaw joint disorders, dental infections,nerve related disorders, oral submucous fibrosis, TMJ/TMD etc.. I would suggest you to consult an Oral Surgeon and get evaluated and he can advise you investigations like Orthopantomogram that is a full mouth x-ray, MRI scan etc to rule out the exact cause of problem and treatment can be done accordingly.. As of now you can start taking anti-inflammatory painkillers like Ibuprofen, muscle relaxant like Chlorzoxasone, do warm compresses and take a soft diet.. Avoid excessive training to open mouth.. Avoid stress as it can add up to your problem.. Take proper rest.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.