Unexplained fertility problems: Your doctor may diagnose an unexplained fertility problem if there's no obvious reason for your infertility (meaning all test results are normal). Some experts believe subtle differences in the way the reproductive system works may cause this type of infertility. This can include differences in follicle development, sperm function, or the fertilization process. Experts also theorize that lifestyle factors – such as being significantly underweight or overweight, regularly consuming too much caffeine or alcohol, and smoking – may be contributing factors as well. Possible symptoms: None. Possible solutions: Fertility drugs (with or without artificial insemination) or IVF. Success rates: For couples with unexplained infertility, the pregnancy rate is between 9 and 26 percent per treatment cycle when fertility drugs are used in combination with artificial insemination. With IVF, the live birth rate is about 30 percent per treatment cycle, but that figure varies depending on age. Best Fertility Care Centre , Maternal & amp; Child Health Care Centre , Advanced Fertility Care Centre , Ashwini Hospital & amp; Fertility Centre Moondrumavadi , K.Pudur Madurai -07