What is the common cold?

The common cold is an upper-respiratory infection caused by various viruses. Runny or blocked nose, sneezing, throat discomfort and cough can occur. Cold weather alone does not create a virus. Most people recover with supportive care, but other illnesses and warning signs need consideration.

Symptoms and transmission

1. Typical course Symptoms often build gradually, with prominent nasal complaints and a potentially longer-lasting cough. Duration varies. Changed mucus color alone does not establish bacterial infection or a need for antibiotics. 2. Differences from influenza Flu more often begins abruptly with severe general symptoms, but overlap occurs. COVID-19 and other infections can look similar. Risk and local advice may indicate tests or assessment; online comparisons cannot establish diagnosis. 3. Reducing spread Hand hygiene, ventilation and covering coughs help. Reducing close contact while ill particularly protects vulnerable people. Shared-space precautions should reflect symptoms and circumstances.

Support and limits

4. Safe relief Rest, appropriate fluids and suitable nasal care may help. Children’s products have age restrictions. Never give honey to babies under one year. Hot-water steam treatments risk burns. 5. Medicines Antibiotics do not treat cold viruses. Symptom products do not necessarily shorten infection; avoid overlapping ingredients. Discuss suitability during pregnancy, hypertension or other conditions with a pharmacist or doctor. 6. Seeking help Breathlessness, chest pain, marked drowsiness, inability to drink or deterioration need assessment. Seek early advice for fever or respiratory problems in young babies. Persistent or repeatedly recurring symptoms should not automatically be called a cold.