More often than not an unusual vaginal discharge is not due to an STI, however in some cases it is. The only way to know is to get tested. Bacterial vaginosis and candidiasis are two causes which are not STI related however they can be diagnosed and treated at Himerus Health. Bacterial vaginosis is an imbalance in the normal bacterial flora of the vagina leading to a change in pH and symptoms such as an itchy malodourous discharge. This is easily treated with the correct antibiotics. Likewise candida is a very common complaint amongst women and can be difficult to distinguish from other causes. It is often a good idea to have an expert opinion if this is something that regularly effect you.