Yes. More so in boys.
Yes. I don't know ANY illness that is NOT aggravated by stress. We all have stress, but react to it in different ways- some have flares of neck or back pain, asthma, headaches, intestinal problems etc., based on our individual constitution. Try to reduce stress with exercise, meditation, adequate rest, healthy diet, talking with friends and family, a good multivitamin, magnesium, herbs like Tulsi tea.