I woke up with a swollen gum and a newly formed abscess below my left jaw, could you please tell me what are the causes? and what should i do ?

Pericoronitis: You may suffer from the condition of pericoronitis, or a swollen gum surrounding a tooth. You also may have an abscess, periodontal or endodontal. Please schedule with your dentist. Fluctuant abscess should be treated with antibiotic to reduce the suppuration and lower the bacterial infection prior to treatment. Consult with your dentist.

Swollen gums abscess: It could be an infection, maybe gum disease or the root. You need an xray and evaluation to be sure.

Bad tooth: Causes may be a 'bad tooth' or recent trauma to a tooth. See a dentist asap.

Get to a dentist!: You have an infection that is trying to drain. It will get worse until you get rid of the cause.

See a dentist ASAP: A tooth infection won't go away without treatment and the infection may spread to your jaw, cheeks, sinus and to other areas of your body. Dentist will treat a tooth abscess by treating the cause and getting rid of the infection. See your dentist ASAP for tooth infection treatment.