 [ Symptoms ] i have had swollen tender itchy breasts for approximately a month and a half what could be the cause  i am 26 years old and due to my birth control pills i have not had a period in 3 years for the past 2 months i have had a period for the first time during that time frame but for the about the past month and a half my breasts have been extremely tender swollen grown nearly a full cup size and itchy only seem to be itchy when i take my bra off at night i have never missed a pill and am 99 sure i am not pregnant [ Disease ] most people know that exercise keeps muscles strong but did you know that strong muscles burn more calories muscle mass is metabolically active tissue in other words the more muscle mass you have the more calories you burn even when you are not working out studies estimate that for each pound of muscle you add to your body you will burn an additional 35 50 calories per day so an extra 5 pounds of muscle will burn about 175 250 calories a day or an extra pound of fat every 14 20 days because guys have more muscle mass they burn calories faster and lose weight more easily than girls so girls need to work out daily to stay strong and in shape