For 3 months i have been getting the hiccups 3+ times a day. what could be the cause of these hiccups?

Irritation: A few things may cause this, but some type of irritation to the diaphragm is most likely the cause. If you are pregnant, your expanding midsection is pushing up on your diaphragm. Another likely cause could be heartburn related. This area few causes that are common. Stress is another common cause.

Unknown: most cause of hiccups are unknown. Treatment by swallowing dry sugar, or swallowing while standing on your head have been proven effective in stopping them.