A yellowish discharge from a cat’s nose is usually caused by a cold or nasal congestion. Pay attention to the cat’s condition. If the cat shows symptoms such as sneezing, runny nose, cough, lack of energy, loss of appetite, etc., it means it has a cold. It is necessary to give the cat anti-inflammatory medicine for pet colds. If the cat has increased eye secretions, red and swollen eyes, etc., then it may be feline nasal congestion. It is best to send it to the pet hospital for examination and treatment immediately to avoid delaying the condition.