It is not good to run when you have a cold. During a cold, the body will have a series of reactions, which are likely to be manifested as weakness and poor physical condition, and running and other sports will aggravate the performance at this time. First of all, some colds may not cause obvious organ damage, and running may only aggravate the symptoms. Secondly, if the cold causes more specific complications, such as myocarditis, running will aggravate the performance of myocarditis. Secondly, if it leads to liver damage, running can also aggravate the liver damage. So during the cold, when you don’t know what complications you have or if you have any, it is better to take rest and drink enough water. Running should be done after the cold is completely healed, and it is not a good condition for running when you have a cold.