Infertility is a condition that exists when a couple is unable to conceive after one year of unprotected sex. In about 20-30% of cases, the cause is unknown.

There are many factors that can contribute to infertility, including age, health conditions, lifestyle choices, and medications.

Age is a major factor in fertility, with women over the age of 35 having a decreased chance of conceiving. Health conditions such as endometriosis, polycystic ovarian syndrome (PCOS), and uterine fibroids can also cause infertility.

Lifestyle choices such as smoking, alcohol consumption, and drug use can also affect fertility. Certain medications can also cause infertility.

There are a variety of fertility treatments available that can help couples conceive. In vitro fertilization (IVF) is a common fertility treatment. IVF involves retrieving eggs from the woman and sperm from the man and then combining them in a laboratory. The resulting embryos are then implanted into the woman's uterus.

Other fertility treatments include intrauterine insemination (IUI), where sperm is inserted directly into the woman's uterus, and fertility drugs, which can help to stimulate ovulation.

There are various fertility treatments available that can help many couples conceive. However, these treatments may not always be successful and can be costly.