Overweight

• If you have a weight problem, this may cause your menstrual cycle to become irregular and may cause a delayed period.
  
  

Underweight

• Conversely, if you are underweight you can experience delayed or missed periods due to undernourishment.
  
  

Pregnancy

• Obviously, pregnancy can be the reason you are having a late period. Taking a home pregnancy test can tell you if this is the reason for your delayed period.
  
  

Peri-Menopause

• If you are over the age of 40, your late or missed period can be due to peri-menopausal reasons, or the onset of menopause.
  
  

Sickness

• If you have recently been sick, or are recovering from an illness, your period may happen later than usual.