<p>FSH sometimes excites the ovaries too much. This may cause pelvic pain or breathing problems. It may also make you urinate less. In rare cases, patients with this problem have had serious lung problems, including fluid in the lungs, troublebreathing, and worsening of asthma blood clots and strokes, severe pelvic pain, chest pain, or abdominal pain, Nausea, Vomiting, Sudden weight gain, Bloating, Trouble, breathing. FSH may cause twins or multiple births. The most common side effects with FSH are headache, vaginal bleeding, nausea, and hot flashes. Sometimes there is a reaction at the spot where you give yourself the injection. This can include bruising, pain, or redness.</p>