Skip to site navigation Skip to Content This content does not have an English version. This content does not have an Arabic version. Brain tumor, breast cancer, colon cancer, congenital heart disease, heart arrhythmia. COVID-19, cold, allergies and cold broccoli salad flu: What are the differences?

It’s usually harmless, although it might not feel that way. Many types of viruses can cause a common cold. Healthy adults can expect to have two or three colds each year. Infants and young children may have even more frequent colds. Most people recover from a common cold in a week or 10 days. Symptoms might last longer in people who smoke.