Common signs of low testosterone, according to doctors - Insider

Testosterone is an important hormone for muscle, bone strength, and sexual health, particularly in men.

Potential red flags that you might want have your testosterone levels tested include changes to mood, energy, fitness, focus, and sexual health.

Since testosterone is an important hormone for muscle building, low levels can lead to loss of muscle or strength, or an inability to make gains, according to Dr

However, it's important to get tested, since using testosterone therapy to boost strength and muscle mass when you don't have a deficiency can have unanticipated side effects, Mirkin said. 

Patients with low testosterone frequently report having a loss of energy, more fatigue during the day, or an inability to keep up with activities they could previously do, including workouts, both Brett and Mirkin said

While there's no sure-fire way to prevent low testosterone, making healthier choices can support healthy testosterone levels, the doctors said.