### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I am a 24 yo Male, 235 lbs. I have a lump in my neck under my jaw-line on the left side. It feels like it may be the lymph node. The lump is about 4cm in diameter. There is also a pressure under my tongue on the left side. It feels like the swelling is pushing up through. There is a lot of tenderness and pain when I touch the swollen area with my tongue. When I try to put food in my mouth or think about eating the swelling gets larger and the pain more severe. The symptoms showed three years ago when I had a root canal done to my teeth. After the root canal the swelling began until a small opening formed and liquid started to come out. The symptoms showed again last year, when I felt severe pain under my tongue- it felt like something under my tongue got knotted. There was reddening in the same area. Yesterday the symptoms showed again when I was eating a salad- the knot feels like it is still there. It hurts to swallow and I cannot eat much. What do you think the diagnosis might be based on this information.

### output:

HI, Dear, Thanks for the query from you for your painful left sided hard lump, which increases in size with the idea of eating along with increase in the severity of pains in the swelling, felt underneath the tongue since 3 yrs after the root canal.1-I feel concerned that you are serious to know where from this hard lump underneath the tongue came from?2-In my opinion this lump has classical symptom complex which suggests that it is originating from the Infected-sub-mandibular salivary gland with Lithuania or stricture causing obstruction of the salivary duct.3-Repeating pain after the idea of eating last yr indicates that the gland is infected since then-due to obstructed submandibular salivary duct.4-Hence the diagnosis of this painful lump in the neck below your jawline is -"chronic submandibular gland amenities, which most probably had occurred after the root canal, which is not related as causal agent.4-a-This lump appeared due to the already existing duct-blockage, which may be due to trauma of the root canal / or may be due to salivary duct stone-/ or may be due to infected salivary gland with inflammatory stricter of the salivary duct of the submandibular gland on left side.4-b-I would advise you to go to ER Surgeon-who would explain on the above referred possibilities for such a painful hard lump underneath the jaw line. 5-Hope this would solve your worry of the hard painful lump in the neck below the Lt jaw line.6-Wellcome to Chat Doctor for any more query.