In undifferentiated connective tissue disease, the life expectancy of patients is approximately equal to that of normal individuals. Because the onset of the disease is usually seen in women of childbearing age, some patients develop the disease in their 50s or 60s. Most patients with undifferentiated connective tissue disease have a good prognosis and rarely experience serious organ damage, so their life expectancy is roughly similar to that of a normal person. Therefore, it is important to establish confidence in overcoming the disease, actively cooperate with treatment, and more importantly, maintain optimism and a normal state of mind. Undifferentiated connective tissue disease, clinically, refers to having certain clinical manifestations of connective tissue disease, but does not meet the diagnostic criteria of any particular disease. So it may be in the early stages of a particular disease or the tonoplastic type, or it may be a separate disease. However, the symptoms are mild and usually do not affect life expectancy.