Dr Tan, haematologist, explains that swollen lymph nodes often appear during infections and are usually tender or painful. Most settle as the infection clears. However, if a lymph node remains enlarged for more than two weeks, especially if it’s firm, non-tender, fixed in place or continues to grow, this warrants a medical review. These features can sometimes indicate a non-infective cause, so early assessment helps ensure the right investigations are done.

During the evaluation, the doctor will take a detailed history and examine the enlarged lymph node to determine whether the swelling is likely related to a recent infection. If there is any concern about a non-infective cause, the doctor may arrange further tests or refer the patient to a specialist for a biopsy if needed.

Swollen lymph nodes can appear in many parts of the body because each group of nodes drains a specific region and helps fight infection there. For example, lymph nodes in the neck often enlarge after an upper respiratory tract infection, while those in the armpit may swell due to infections involving the skin or sweat glands. Inguinal (groin) nodes may react to lower limb infections.

Clinically, location does matter. While many swollen nodes are related to common infections, supraclavicular lymph nodes warrant closer attention because swelling in this area is more often associated with non-infective or underlying systemic causes. This is why their location can raise greater concern and prompt further evaluation.

When a swollen lymph node is located in a higher-risk region such as the supraclavicular area, doctors assess it more closely because this location can sometimes suggest deeper or more extensive involvement. A CT or PET-CT scan may be ordered if there is suspicion that other lymph nodes elsewhere in the body could also be affected. If there is concern that the lymph node may represent metastatic involvement from a primary cancer, further investigations relevant to the suspected source would be arranged.

According to Dr Tan, normal lymph nodes that are painless can sometimes be felt in individuals with very little subcutaneous adipose tissue, which is the layer of fat just beneath the skin. In other words, people who are naturally lean may notice palpable nodes without it indicating disease. He highlights that this is why it’s important not to jump to conclusions based solely on the presence of a painless lump.

His practical advice is to review any concerns with a general practitioner, who can assess whether the lymph nodes have features that warrant further evaluation. If there is any suspicion of lymphoma or another cancerous process, imaging such as an ultrasound, CT scan or PET-CT scan may be recommended. These results then help determine whether a biopsy is needed, ensuring that investigations remain appropriate without over-testing.

If the lymph node becomes smaller on its own, especially as infective symptoms resolve, malignancy is less likely. However, if it becomes larger and firmer over time, further investigations may be necessary.

Many people worry that swollen lymph nodes automatically signal something serious, but this is one of the most common misunderstandings. Lymphomas are actually rare, and the most frequent cause of swollen lymph nodes is still infection. Believing otherwise can create unnecessary anxiety and lead people to assume the worst before giving the body time to recover.

The practical approach is to stay calm, monitor the swelling and check with a doctor if there is any concern. Most reactive lymph nodes resolve once the underlying infection settles, so understanding this helps reduce both panic and the risk of misinterpreting normal immune responses as something dangerous.

Dr Tan notes that allergies can sometimes cause lymph nodes to swell, but stress and lack of sleep generally don’t. He adds that mild or transient swelling, especially when there are no other symptoms, is often harmless. As mentioned earlier, it’s important not to become overly anxious when a swollen lymph node is noticed. The sensible approach is to monitor it, check with a doctor if there are concerns and allow some time for it to resolve.