症状（英语：symptom），或征状，医学术语，在疾病学的领域里，「症状」是描述疾病的很重要的参数之一，代表的是「来自病人的主观感受」。

英文的symptom，字根来自于希腊文σύμπτωμα，意思是「降临在身上的不幸与恶运」。

在中文，「症状」常和「体征」搞混。症状是患者描述的主观感受、体征则是外部观察到的客观事实。举例来说，流鼻涕、头昏及体温超过摄氏三十八度，这三者都是感冒的元素：但流鼻水及头昏是感冒的症状；而体温超过三十八度，则是感冒的体征。

A symptom (from Greek σύμπτωμα, "accident, misfortune, that which befalls", from συμπίπτω, "I befall", from συν- "together, with" and πίπτω, "I fall") is a departure from normal function or feeling which is noticed by a patient, reflecting the presence of an unusual state, or of a disease. A symptom is subjective, observed by the patient, and cannot be measured directly, whereas a sign is objectively observable by others. For example, paresthesia is a symptom (only the person experiencing it can directly observe their own tingling feeling), whereas erythema is a sign (anyone can confirm that the skin is redder than usual). Symptoms and signs are often nonspecific, but often combinations of them are at least suggestive of certain diagnoses, helping to narrow down what may be wrong. In other cases they are specific even to the point of being pathognomonic.