A cold is a common viral infection of the upper respiratory tract. Symptoms include a runny nose, sore throat and cough. It usually clears up within 7–10 days.
Medically reviewed by Adi Zoabi, Approbation als Arzt.
Last reviewed on August 31, 2026. Updated as clinical guidelines change.
The common cold is a usually harmless infection of the upper respiratory tract that develops step by step: it often starts with a scratchy or sore throat, followed by a runny nose and cough. Symptoms peak after two to three days and then gradually ease. In most people, a cold resolves on its own without any lasting effects.
Colds are triggered by a wide range of viruses, most commonly rhinoviruses. They spread through droplets released when coughing and sneezing, as well as via contaminated hands and surfaces. Close contact in enclosed spaces, particularly during the cold season, makes transmission more likely. A weakened immune system, lack of sleep, stress and dry indoor heating air can further increase susceptibility.
A medical check-up is advisable if symptoms last longer than about ten days or clearly worsen, in the case of high or renewed fever, severe throat or ear pain, or purulent sputum. People with pre-existing conditions, pregnant women, young children and older adults should seek advice sooner. In the event of acute shortness of breath, tightness in the chest or drowsiness, call the emergency number 112.
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Medical notice: Not a substitute for an in-person medical examination. The information on this page is intended for general guidance only. In an emergency, please call 112.
A typical cold lasts 7 to 10 days. Symptoms are at their strongest during the first 2–3 days and then gradually ease off.
See a doctor if your symptoms last longer than 10 days, you have a high fever, or you develop difficulty breathing.
Yes, at OpenClinic24 you can obtain a sick note for a cold following a video consultation.
