Forests are essential for life on earth. Three hundred million people worldwide live in forests and 1.6 billion depend on them for their livelihoods. Forests also provide habitat for a vast array of plants and animals, many of which are still undiscovered. They protect our watersheds.
The other cause is migraine headaches that can affect some women prior to their period following ovulation. Nausea typically accompanies migraines regardless of the cause of the headache. In this case the headaches are caused by the hormonal imbalance and they can be completely debilitating along with the nausea.
Estrogen and other hormones increase and then begin to cycle at puberty, resulting in a surge in headache activity for many girls. The cycling of hormones and other body chemicals with monthly menstrual periods often causes a marked increase in headache frequency and severity with menstrual flow and, to a lesser extent, mid-cycle with ovulation. A variety of factors contribute to a reduced headache threshold with menstruation: