The Ovulation and Testosterone Trigger
LH is the signal your pituitary sends to your gonads. In women, the LH surge triggers ovulation (what ovulation kits detect). In men, LH continuously stimulates testes to produce testosterone. LH tells you whether a hormone problem is in the brain (pituitary) or the gonads.
What is LH (Luteinizing Hormone)?
LH is a gonadotropin from the anterior pituitary. Pulsatile secretion. In women: fluctuates dramatically (low → surge → moderate). In men: relatively stable. LH:FSH ratio >2 in women suggests PCOS.
↑ What High LH (Luteinizing Hormone) Means
Pituitary sending a strong signal. Women: ovulation surge, menopause (pituitary screaming at non-responsive ovaries), or PCOS. Men: testes not responding (primary hypogonadism).
Common symptoms:
Women: hot flashes (menopause), irregular periods (PCOS) · Men: indicates testicular failure
↓ What Low LH (Luteinizing Hormone) Means
Pituitary isn't sending enough signal. From stress, extreme weight loss, pituitary tumors, or anabolic steroid use.
Common symptoms:
Women: absent periods, infertility · Men: low testosterone symptoms · Both: low libido, fatigue
Why It Matters
When normal:
Triggers ovulation
Stimulates testosterone production
Distinguishes primary vs secondary hypogonadism
Guides fertility treatment
Risks if abnormal:
High LH + low sex hormones = gonadal failure
Low LH + low sex hormones = pituitary/hypothalamic problem
Elevated LH:FSH = PCOS pattern
What Can Cause Abnormal Levels?
Menopause/Gonadal Failure (high)
50% likelyNo gonadal feedback → pituitary increases LH.
Hypothalamic/Pituitary Dysfunction (low)
40% likelyStress, eating disorders, pituitary tumors suppress LH.
PCOS (high/elevated ratio)
Increased GnRH frequency preferentially raises LH over FSH.
Anabolic Steroids (low)
Exogenous testosterone suppresses LH via negative feedback.
Hyperprolactinemia (low)
High prolactin suppresses GnRH and LH.
What You Can Do
Adequate caloric intake and body fat
Impact: Undernutrition is a major LH suppressor \u00B7 Timeline: 4-12 weeks
Stress management
Impact: Cortisol suppresses GnRH and LH \u00B7 Timeline: 4-8 weeks
If lifestyle changes aren't enough:
Zinc and vitamin D optimization
Impact: Support reproductive hormone signaling \u00B7 Timeline: 4-8 weeks
Recommended retest: Women: day 3; Men: morning; 4-8 weeks after intervention
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