Common side effects of oral contraceptives include: intermenstrual spotting, nausea, breast tenderness, headaches, weight gain, mood changes, missed periods, decreased libido, vaginal discharge and visual changes with contact lenses.
We'll look at each of these side effects in detail below.
1. Intermenstrual spotting
Approximately 50% of people using the pill experience vaginal bleeding between expected periods - also known as breakthrough bleeding - most commonly within the first 3 months of starting to take the pill. Generally, this resolves in over 90% of cases by the third pill pack.
During spotting, the pill is still effective as long as it has been taken correctly and no doses were missed. People who experience 5 or more days of bleeding while on active pills or heavy bleeding for 3 or more days should contact a health care professional for advice.4
Intermenstrual spotting may occur due to the uterus adjusting to having a thinner endometrial lining, or maybe due to the body adjusting to having different levels of hormones.
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2. Nausea
Some people experience mild nausea when first taking the pill, but symptoms usually subside after a short period of time. Taking the pill with food or at bedtime can help lower the likelihood of nausea. Anyone experiencing persistent or severe nausea should seek medical guidance.4
3. Breast tenderness
Birth control pills may cause breast enlargement or tenderness. This side effect tends to improve a few weeks after starting the pill, but anyone who finds a lump in the breast or who has persistent pain or tenderness or severe breast pain should seek medical help.
Reducing caffeine and salt intake can decrease breast tenderness, as can wearing a supportive bra.4
4. Headaches
woman curled up with nausea

Some people experience side effects with "the pill," such as irregular periods, nausea, headaches or weight change.
The sex hormones have an effect on the development of headaches and migraine. Pills with different types and doses of hormone may result in different headache symptoms. Some studies have previously suggested that headaches are least likely to occur with pills that contain low doses of hormones.6
Headache symptoms are likely to improve over time. Anyone who experiences new onset of headaches when taking the pill should seek medical attention.
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5. Weight gain
Clinical studies have found no consistent association between the use of birth control pills and weight fluctuations. However, many people taking the pill report experiencing some fluid retention, especially in the breast and hip areas.4
Fat cells can also be affected by the estrogen in birth control pills, although the hormone causes the cells to become larger rather than more numerous.7
6. Mood changes
People with a history of depression are recommended to discuss this with their medical provider, as some people do experience depression or other emotional changes while taking the pill. Anyone experiencing mood changes during pill use should contact their medical provider.4
A study of 90 women published in Human Mapping in 2015 found that use of the birth control pill was associated with smaller cortical thickness measurements in the lateral orbitofrontal cortex and the posterior cingulate cortex. These areas of the brain are linked with reward response and evaluating incoming stimuli.8
The authors of the study write that further research needs to be conducted to confirm whether or not there is a connection between cortical thinning in these areas of the brain, mood changes and birth control pill use.
7. Missed periods
There are times when, despite proper pill use, a period may be skipped or missed. Several factors can influence this, such as stress, illness, travel, and hormonal or thyroid abnormalities.
If a period is missed or is very light while on the pill, a pregnancy test is recommended prior to taking the next pack of pills; if further periods are missed or are very light, seek medical advice.4
8. Decreased libido
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