Which of the following is a common symptom of STDs?

Unusual discharge is a common symptom of sexually transmitted diseases (STDs) because many STDs, particularly those that affect the urogenital tract, can provoke changes in normal discharge. For instance, infections such as chlamydia and gonorrhea often result in an increased, cloudy, and sometimes foul-smelling vaginal or penile discharge. This symptom can vary depending on the specific infection and may be accompanied by other signs such as itching, burning, or irritation.

The presence of unusual discharge often serves as a critical indicator for healthcare providers to perform further evaluations and testing for STDs, which is essential for timely diagnosis and treatment. Identifying this symptom can help prevent the complications associated with untreated STDs, which can lead to more severe health issues such as infertility or increased susceptibility to HIV.

While joint pain, skin rashes, and fatigue can be associated with certain STDs or other medical conditions, they are not as consistently indicative across the range of sexually transmitted infections as unusual discharge is. Therefore, unusual discharge stands out as a key symptom in the context of STDs.