Stress can and often does result in hair loss. This is because stress, through a convoluted route, can cause your body to produce more adrenaline. Simply put, adrenaline can be converted into cholesterol, a substance which can in turn raise your body’s levels of testosterone - a male hormone (androgen) that causes hair loss and/or thinning in people who have follicles sensitive to it.
However, please remember stress won't cause hair loss straight away. Any hair loss you experience will present itself anywhere from 6 - 12 weeks later due to your hair growth cycle.
There is no cure for follicle sensitivity, and so the best ways to tackle and improve stress related hair loss is to use preventative measures. Try to reduce your stress levels with yoga, meditation or moderate exercise. You may also want to talk to your doctor about alternative treatments, such as acupuncture or herbal remedies.