The body's hormones are primarily responsible for controlling many of its basic functions. They act as a kind of communication system, enabling cells to communicate with each other and organizing processes such as digestion and development, immune function, the libido of an individual, and mood. Consequently, a hormone imbalance however small may result in negative effects throughout the body. These effects may manifest as manifesting itself in ways such as inability to perform in bed or abrupt irritability. Bioidentical hormone replacement therapy (BHRT) may help with these issues.