A secondary headache is a symptom of a disease that can activate the pain-sensitive nerves of the head. Any number of conditions â varying greatly in severity â may cause secondary headaches. Possible causes of secondary headaches include: Acute sinusitis. Arterial tears (carotid or vertebral dissections)
The fallopian tube is a crucial structure involved in successful reproduction and, like with all structures in the human body, sometimes problems occur that hinder the structure's ability to function properly.
One of the major causes of infertility is fallopian tube obstruction. The fallopian tubes are the uterine tubes where fertilization occurs. When they are blocked, the sperm and the egg cannot meet, thus, the egg cannot be fertilized.In fact, blocking the fallopian tubes is sometimes used as a contraceptive method.he fallopian tubes are the uterine tubes where fertilization occurs. When they are blocked, the sperm and the egg cannot meet, thus, the egg cannot be fertilized. In fact, blocking the fallopian tubes is sometimes used as a contraceptive method.