
One of the most important signs of tonsil cancer is actually not always pain in the tonsil itself, but a lump in the neck. The reason for this is that tumors in the tonsil area may spread at an early stage to the lymph nodes in the neck. Sometimes a person feels a small, hard, or fixed lump on one side of the neck that does not cause pain and is therefore easy to ignore.
Lymph nodes can also swell for very harmless reasons, such as a cold, a dental infection, a mouth sore, or a skin infection. Such nodes are usually tender to the touch, appear around a clear illness, and gradually shrink after the body recovers. In contrast, a lump that is not painful, does not shrink after two or three weeks, grows over time, or appears without clear signs of infection warrants a visit to the doctor. At age 50 and above, a new lump in the neck is a symptom that should not be taken lightly.

Ear pain sounds like a problem of the ear, but sometimes the source of the pain is actually in the throat. The tonsil area and the ear share common nerve pathways, so irritation or a tumor in the tonsil may cause pain that is felt in the ear, even when the examination of the ear itself is normal.
A one-time earache, pain that appears after a cold, or pain accompanied by a feeling of pressure, a decrease in hearing, or fluid in the ear, is often related to an infection or congestion. In contrast, one-sided ear pain that persists, keeps coming back, is not explained by a finding in the ear, or appears together with one-sided throat pain and the additional symptoms presented below, definitely needs to be checked.
Difficulty swallowing can appear due to a throat inflammation, reflux, dry mouth, dental problems, certain medications, or a general decrease in the amount of saliva. When it is a mild and temporary phenomenon that appears during a passing illness, there is usually no need to be alarmed. Pain while swallowing can also be part of an ordinary throat inflammation.
That said, there is a difference between temporary pain and a persistent change in function. If food "gets stuck" in the throat, if swallowing becomes harder over time, if you need to drink a lot in order to get food down, or if speech changes without a clear explanation - these are signs that require an examination. Tonsil cancer may affect the movement of the tongue, the pharynx, and the muscles involved in all of these processes, so a change that affects eating or speaking should receive medical attention.
Bad breath is a very common phenomenon, and in most cases it is related to oral hygiene, dry mouth, gum inflammation, food remnants, or similar minor problems. Tonsil stones, for example, can cause a strong and unpleasant odor, but they are not cancer. A strange taste in the mouth may also appear after a viral illness or the use of certain medications, and this is a fairly common side effect.
The cause for concern arises when bad breath appears together with additional symptoms: one-sided throat pain that does not go away, difficulty swallowing, light bleeding in the saliva, a sore in the back area of the mouth that does not heal, or a lump in the neck. A tumor in the tonsil area may trap food remnants, cause local inflammation, or a sore that does not heal, and all of these may cause an unusual odor. Bad breath on its own is usually not a sufficient sign of cancer, but when it is part of a broad and persistent picture, it is worth looking into the matter more deeply.

Mouth sores are common, especially after a bite, a burn from hot food, friction from a sharp tooth, or a canker sore. What requires an examination is a sore in the back area of the mouth that does not heal, a red or white patch that does not disappear, one tonsil that looks significantly larger than the other, unexplained bleeding in the saliva, or a cough with blood that is not related to a clear injury.
It is not always possible to see the tonsils well at home, so there is no point in trying to diagnose this symptom on your own in front of the mirror. If there is a change that persists or symptoms that appear together, a professional examination by an ear, nose, and throat doctor can make the difference between an unfounded worry and an early diagnosis of a real problem.

The practical rule is simple: don't panic, but don't ignore it either. One mild symptom that lasts a few days during a cold is usually not a reason to suspect cancer. In contrast, symptoms that last over time, appear on one side, gradually worsen, or include a lump in the neck, unexplained ear pain, difficulty swallowing, bleeding, or unexplained weight loss, most likely warrant a visit to the doctor.
The first step can be a meeting with a family doctor, a dentist, or an ear, nose, and throat doctor. If there is a lump in the neck or a persistent one-sided symptom, it is recommended to have an ear, nose, and throat examination. The doctor may examine the mouth and throat, feel the neck, and if necessary refer you for imaging or a biopsy. In most cases it will turn out to be a different and far more common problem, but when it is tonsil cancer, early detection can greatly affect the treatment options and the chances of recovery.