Myth or Fact: Can Birth Control Really Cause Hair Loss

Hormonal contraceptives, also known as hormonal birth control, are a popular choice for many Australian women, offering reliable contraception and, for some, additional benefits like clearer skin or lighter menstrual periods [1]. 

Yet, concerns about possible side effects, especially hair loss—are common. Does birth control really cause hair loss, or is this a myth? Let’s explore the facts, clear up misconceptions, and provide guidance on what to do if you notice changes in your hair while using hormonal contraceptives.

Hormonal contraceptives come in several forms [2], including:

• Combined oral contraceptive pills (containing oestrogen and progestin)
• Progestin-only pills (the “mini pill”)
• Hormonal IUDs
• Contraceptive implants
• Injections (such as Depo-Provera)
• Patches and vaginal rings

Each form of birth control works by altering hormone levels to prevent ovulation or make the uterus less hospitable to pregnancy [3].

Hair growth follows a natural cycle: growth (anagen phase), transition (catagen phase), and rest (telogen phase) and shedding (exogen phase). Hormones, especially androgens, can influence this cycle [4]. 

Some women are more sensitive to hormonal changes, which can trigger hair shedding or thinning, particularly during times of hormonal fluctuation such as starting, stopping, or changing birth control methods that contain different progestins [5].

Research shows that some women may experience changes in their hair, such as thinning or increased shedding, after taking birth control or when the IUD is removed. This is often a temporary condition called telogen effluvium, where more hairs than usual enter the resting phase and fall out a few months later[6]. The risk of hair loss is higher for those with a family history of androgenic or female pattern hair loss, or underlying conditions like polycystic ovary syndrome (PCOS)[7].

Birth control pills with a higher androgen index (meaning they have more androgenic activity) are more likely to contribute to hair thinning in sensitive individuals. Pills with a low androgen index are less likely to cause this side effect and may even help with hair growth in some cases. Pills with anti-androgenic properties may actually help treat acne and support health hair growth by counteracting the androgenic effects of hormones [8].

If you use a form of birth control, like the Mirena IUD or Depo-Provera, you may notice differences in your scalp health, such as reduced hair density or excessive hair growth in unwanted areas (like facial hair growth) [9].

For most women, hair loss related to birth control is temporary. Hair typically regrows once the body adjusts to the new hormone levels or after stopping the pill. However, if there is a genetic predisposition to female pattern hair loss, hormonal changes may exacerbate the process or trigger long-term changes in hair health [10].

Genetic factors play a significant role in female pattern hair loss. If close relatives have experienced hair thinning, you may be more susceptible, regardless of contraceptive use [11].

Other factors that can contribute to hair loss include:

• Physical or emotional stress
• Poor nutrition or rapid weight loss
• Thyroid disorders
• Iron deficiency
• Autoimmune conditions

Addressing these underlying issues is important to support healthy hair growth and overall scalp condition [12].

If you’re concerned about hair thinning, speak with your healthcare provider or a gynaecologist before changing contraception or switching to a low-androgen index pill, which may be less likely to impact hair or cause unwanted side effects, such as hair thinning. These formulations are less likely to trigger hair loss and may be a better fit for those with a family history of androgenic alopecia[13].

• Eat a balanced diet rich in protein, iron, and vitamins
• Avoid harsh hair treatments and heat styling
• Manage stress with relaxation techniques
• Use gentle, nourishing hair care products that help protect the scalp and hair follicles

If you notice persistent or severe hair loss, or if shedding continues for more than six months, consult a healthcare professional for professional guidance. A healthcare professional can test sex hormone-binding globulin (SHBG) levels and assess whether hormones in birth control are influencing your anagen phase or exacerbating hair loss. Early intervention can help identify the cause and guide you toward effective solutions [15].

How Moshy Supports Your Hair and Hormonal Health

At Moshy, we understand the impact that hair loss can have on your confidence and well-being. Our accredited practitioners offer personalised, online consultations to assess your unique needs, review your medical history, and recommend evidence-based solutions tailored to you. Whether you’re experiencing hair thinning on birth control or have other concerns, our team is here to support you every step of the way.

Ready to take control of your hair and hormonal health? Start your free consult with a Moshy practitioner today.