Blood clots: Here's why they occur during menstruation, remedies

Even though occasional blood clots are normal and don’t need to be treated, they sometimes indicate underlying conditions.

Period blood clot

The frequency, amount and duration of a menstrual cycle vary from woman to woman and month to month.

The same applies to other period symptoms such as cramping, blood clots, blood colour, or odour.

It’s usual to experience a heavy blood flow at the beginning of a menstrual cycle. Due to this, we’ve all sometimes leaked through a pad or tampon or noticed blood clots during our periods.

Passing blood clots throughout the monthly cycle is a common occurrence. But passing large blood clots along with heavy blood bleeding may be a sign of something wrong.


Even though occasional blood clots are normal and don’t need to be treated, they sometimes indicate underlying conditions like anaemia (iron deficiency).

What are blood clots?

Blood cells, tissue from the lining of the uterus and proteins in the blood combine together to form menstrual clots. They are a part of the body’s defence mechanism to prevent excess blood from escaping.

Menstrual clots are relatively common in the first two days of the menstrual cycle when the blood flow is typically heavy. However, this natural monthly cycle becomes a cause of concern when you start passing large blood clots as it can be a sign that something is not normal.

When you should be concerned


Several conditions can cause women to have heavy periods or abnormally large blood clots alongside heavy period blood.

Some of the causes include:

  • Uterine polyps
  • Polycystic ovarian syndrome (PCOS)
  • Fibroids
  • Endometriosis
  • Thyroid disease
  • Bleeding disorder
  • Cancer of the cervix or uterus


Finding out the cause behind abnormal heavy menstruation will allow a doctor to plan the course of treatment.


Also, an iron supplement may be recommended if you are losing too much blood or is at risk of anaemia.

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