Which symptom is commonly associated with trichomoniasis?

Itching and irritation are indeed commonly associated with trichomoniasis, which is caused by the protozoan parasite Trichomonas vaginalis. This infection often leads to inflammation and irritation of the genitals, which manifests as itching and discomfort in both male and female patients.

In females, trichomoniasis can result in a variety of symptoms including a frothy, malodorous vaginal discharge, and that discharge may accompany itching and irritation. Males may experience irritation inside the penis and discomfort during urination or ejaculation, which can also contribute to the overall symptomology.

The other symptoms listed, while they may relate to different conditions or types of infections, are not as characteristic of trichomoniasis specifically. For instance, abdominal pain can occur with other pelvic infections, thick curd-like discharge is more associated with candidiasis (a yeast infection), and burning with urination can be a symptom of several different infections including urinary tract infections or sexually transmitted infections but is not unique to trichomoniasis. Thus, the symptom of itching and irritation is the most directly aligned with the presentation of trichomoniasis.