Pain or heaviness in breasts, lower abdomen, lower back and/or thighs before or during periods is quite common. It might help to use a hot water bag and/or gently massage the lower abdomen. Gentle exercise like walking and doing routine daily activities is helpful in preventing muscles from cramping up. In case of extreme pain, excessive flow or irregular cycles, please consult a gynaecologist as soon as possible. Avoid taking medicines on your own to hasten or delay periods.