The key symptoms of low free testosterone levels include:
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Low free testosterone can lead to a decreased libido and difficulty achieving or maintaining an erection.
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Men with low free testosterone often report feeling consistently tired and lacking motivation.
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Mood changes and depression123
Testosterone influences mood, and low free testosterone levels have been linked to mood swings, irritability, and depression.
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Decreased muscle mass and increased body fat123
Free testosterone is important for building and maintaining muscle mass, so low levels can result in loss of muscle and gain of body fat.
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Bone density loss and increased fracture risk123
Testosterone helps maintain bone strength, so low free testosterone can contribute to osteoporosis and a higher risk of bone fractures.
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Smaller testicle and penis size13
Testosterone is required for the proper development of male sexual organs, so low free testosterone may lead to smaller than normal testicles and penis.
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Testosterone plays a role in hair production, so low free testosterone can cause balding or loss of body/facial hair.
In summary, the main symptoms of low free testosterone include sexual dysfunction, fatigue, mood changes, loss of muscle mass, bone density issues, and changes in sexual characteristics. 12345
Citations:
[1] https://www.healthline.com/health/low-testosterone/warning-signs
[2] https://lowtcenter.com/news-article/low-testosterone-free-vs-total-testosterone/
[3] https://my.clevelandclinic.org/health/diseases/15603-low-testosterone-male-hypogonadism
[4] https://my.clevelandclinic.org/health/diseases/24897-low-testosterone-in-women
[5] https://www.webmd.com/a-to-z-guides/testosterone-test