Pregnancy and having too little body fat are the primary reasons assuming that you are not perimenopausal or in menopause. Certain pharmaceutical drugs can also disrupt a woman's menstrual cycle.
If you are younger than 35, have more than about 15% body fat and are definitely not pregnant, then you should visit your gynecologist and inform her of every medication and supplement you are taking.
Butt
Sounds like timing or fueling issues.
Yes you can, as long as you are in the fertile phase of your cycle.
Yes many times, and for long periods of time.
Uranus has a pole that faces the sun due to its unique tilt in its axial rotation. This causes its poles to experience long periods of sunlight (about 42 years each) followed by long periods of darkness.
dark spot
periods
not drinking enough water, not urinating for long periods of time, having a catheter in place, and not fully emptying your bladder
No.
Just decreased effectiveness. Vyvanse molecules remain stable for long periods of times.
It can take months for your periods get back to normal, especially if you are breast feeding you can miss periods or have long times between them. You can still get pregnant while breast feeding and having irregular periods though so you should still use contraception.
You don't have periods at all..