Infertility is medically defined as occurring when a woman is unable to get pregnant despite having unprotected sex for a year or longer. Because barriers fertility can exist in both men and women, it is often said that the couple, rather than the woman, is experiencing infertility.
Why Does Infertility Develop?
Understanding what causes infertility is essential for prevention and treatment. Research consistently shows that infertility arises from a complex interplay of biological, psychological, and social factors — rarely from a single cause.
Core Causes and Triggers
Every woman is born with a set number of eggs, which declines as she ages. To get pregnant, an egg released from a woman’s ovaries must be fertilized by sperm, travel down the fallopian tube, and attach to the side of her uterus. At any stage along the way, a problem may occur, resulting in a case of infertility. Couples experiencing infertility have a range of treatment options. However, infertility treatment can come with many obstacles, including high costs, time burden, physical pain, shame and embarrassment , and social stigma . Talking to a trusted family member, friend, or therapist can
Biological Factors
Biological contributors to infertility include:
- Genetics: Family history increases risk; certain genes influence vulnerability
- Brain chemistry: Neurotransmitter imbalances (serotonin, dopamine, norepinephrine) play key roles
- Brain structure: Differences in the prefrontal cortex, amygdala, and hippocampus are documented
- Physical health: Chronic illness, hormonal changes, and sleep disruption can trigger or worsen infertility
Psychological Factors
- Early experiences: Childhood adversity, attachment disruption, and trauma shape psychological vulnerability
- Cognitive patterns: Negative thinking styles, perfectionism, and rumination increase risk
- Coping skills: Limited emotional regulation skills make infertility more likely under stress
- Personality: Certain traits (neuroticism, harm avoidance) are associated with higher risk
Social and Environmental Factors
Environmental factors — including chronic stress, relationship problems, financial difficulty, and major life events — can trigger infertility in vulnerable individuals.
What Triggers an Episode?
Even in people with predisposing factors, infertility often requires a triggering event:
- Major life transitions (job loss, relationship breakdown, bereavement)
- Prolonged stress without adequate recovery
- Substance use or withdrawal
- Physical illness or injury
- Social isolation or conflict
Protective Factors
Not everyone with risk factors develops infertility. Protective factors include: strong social support, effective coping skills, physical health maintenance, access to care, and psychological resilience built through prior challenges.