Sore throats are very common, and usually get better within seven days, according to the NHS.
If the condition lasts longer than three or four weeks, though, you should seek medical attention, as it could be a sign of an underlying medical condition.
A persistent sore throat could be a sign of throat cancer, according to medicine manufacturer A.Vogel.
Throat cancer can affect any part of the structures in the throat or mouth, including the oropharynx, the hypopharynx, or the nasopharynx.
“It is a relatively rare form of cancer, but a persistent sore throat can be a sign of the problem,” said A.Vogel.
“The feeling of a foreign body when you swallow, or lump in the neck or throat, may also be an indication of throat cancer.”
Glandular fever may also be causing the long-lasting sore throat. The condition – most common among teenagers and young adults – is a viral condition that causes extreme fatigue, swollen glands and a severe sore throat.
You should see a GP if you have a particularly bad sore throat, a high fever, or exhaustion, the NHS said.
A persistent sore throat could also be caused by tonsillitis.
Tonsillitis symptoms include a sore throat, headaches, fever and coughing. It mainly affects young children, but it can affect people of all ages.
Laryngitis may be the cause of a sore throat, too. The condition is an inflammation of the voice box (larynx).
Overusing your voice or smoking could increase the risk of developing laryngitis.
Most sore throats are caused by other illnesses, including colds or flu, the NHS said.
Treatments for a sore throat including painkillers, drinking plenty of fluids, and avoiding smoky places.
Eating cool, soft foods could help to soothe the throat. It could also help to suck lozenges, hard sweets, ice cubes or ice lollies.
You should visit A&E if the symptoms of a sore throat are severe, or get worse very quickly.
Seek medical help if breathing becomes difficult, or if you make a high-pitched noise when you breathe.