Are Testosterone Therapy Side Effects in Men Serious?
Editorial Team - MSN, FNP-C
Last Updated: October 31, 2026
Quick Summary
Testosterone therapy side effects in men range from mild skin changes like acne and oily skin to rare but serious risks such as blood clots, heart events and prostate changes. Most men tolerate treatment well, but regular monitoring with blood work helps catch problems early.
- Acne, oily skin, mood shifts and libido changes are the most common complaints and are usually mild.
- Gels carry a transfer risk to others, so cover application sites and wash hands after applying.
- Chest pain, one-sided weakness, trouble speaking or a swollen painful leg need a 911 call immediately.
- Clinicians commonly check a complete blood count, and sometimes PSA, during therapy.
- Men who want children should discuss fertility effects with a clinician before starting treatment.
Table of Contents
- Common Side Effects: Acne, Oily Skin, Mood Changes and Libido
- Testosterone Injection Side Effects and How They Differ by Delivery Method
- Testosterone Gel Side Effects and Skin Transfer Risks
- Serious Risks: Blood Clots, Cardiovascular Events and Prostate Changes
- Signs of Too Much Testosterone in Men and When to Seek Urgent Care
- Testosterone Therapy Monitoring: Tests and Schedule to Discuss With Your Clinician
- Frequently Asked Questions
Testosterone therapy side effects in men range from mild skin changes to rare but serious heart and clotting risks. Most men tolerate treatment well, yet the side effects are real enough to plan for. Selah Aesthetics and Wellness, a medical aesthetics and wellness practice in Columbus, GA, serves women and men. This guide walks through what to expect, which problems need quick attention, and what monitoring looks like.
Testosterone therapy side effects in men are not all alike. Some show up within weeks and fade with dose changes. Others build slowly and need blood work to catch. Knowing which is which makes the treatment safer and far less stressful.
Most side effects connect to how much testosterone the body carries. Higher levels can push the body toward more oil, more red blood cells and more fluid. That is why a clinician adjusts dose and checks labs rather than guessing.
Treatment is not a one-time decision. A man on testosterone therapy should expect regular follow-up, and he should report new symptoms early.
Common Side Effects: Acne, Oily Skin, Mood Changes and Libido
The most common complaints are skin and mood changes. Acne and oily skin often appear first, especially on the face, chest and upper back. These effects are usually mild, and a clinician can advise on managing them.
Mood and libido shifts are also common. Some men feel more energy and drive. Others notice irritability or sleep changes. Libido often rises, but it can also swing too high when doses are not right.
A few practical steps help:
- Wash face and back daily with a gentle cleanser
- Track mood and sleep in a simple notebook
- Mention any change in sex drive at each visit
- Report acne that does not respond to basic care
Fluid retention and breast tenderness can also occur. Watch for swelling in the ankles or changes in nipple sensitivity, and bring them up with a clinician.
Testosterone Injection Side Effects and How They Differ by Delivery Method
Delivery method shapes which side effects are most likely and how they show up. The four main options, injections, gels, transdermal patches, and subcutaneous pellets, differ in how steady blood levels are, what local reactions occur, and what practical precautions matter. A clinician matches the method to a man's labs, lifestyle, and tolerance, but knowing the trade-offs helps a man ask better questions.
Injections (intramuscular or subcutaneous). Injections deliver a concentrated dose, so blood levels peak a few days after a shot and dip before the next one. That swing can affect mood, energy, acne, and libido. Common local effects include pain, redness, bruising, and small lumps at the injection site; rotating sites and following the clinician's technique usually reduces them. Because injections bypass the skin, transfer to others is not a concern. The main trade-off is the peak-and-trough pattern and the need for a reliable injection schedule.
Gels. Gels give steadier daily levels but carry the distinctive risk of skin-to-skin transfer to a spouse, child, or pet. Application-site irritation, redness, and acne are also common. Letting the gel dry fully before dressing and washing hands after applying lowers transfer risk. The trade-off is daily application and the need to manage contact precautions.
Transdermal patches. Patches also provide steady levels and avoid the injection peak-and-trough. Skin irritation at the patch site is the most common complaint, and some men develop redness or itching that requires rotating sites or switching methods. Like gels, patches carry a transfer risk if contact occurs before the adhesive is secure, though it is generally lower than with gels.
Subcutaneous pellets. Pellets are inserted under the skin and release testosterone over weeks to months, so they avoid daily application and injection peaks. Local effects include bruising, tenderness, and, rarely, infection or pellet extrusion. Because levels are not easily adjusted once pellets are placed, a clinician cannot fine-tune the dose between insertions the way they can with injections or gels.
A practical comparison helps:
- Steadiest levels: gels, patches, and pellets; injections have the most peak-and-trough variation.
- Transfer risk to others: highest with gels, lower with patches, not a concern with injections or pellets.
- Local skin or site reactions: common with all methods but differ in type, injection lumps, gel irritation, patch redness, pellet bruising.
- Dose flexibility: highest with injections and gels; lowest with pellets.
The four main delivery methods differ in how steady blood levels stay, how transfer risk is handled, and what local reactions to expect.
| Method | Steadiness of levels | Main side effect or risk |
|---|---|---|
| Injections | Peak and trough between shots | Pain, redness, bruising, lumps at site |
| Gels | Steadier daily levels | Transfer to others, application-site irritation |
| Transdermal patches | Steady levels, no peak-and-trough | Skin irritation or redness at patch site |
| Subcutaneous pellets | Released over weeks to months | Bruising, tenderness, rare infection or extrusion |
Testosterone Gel Side Effects and Skin Transfer Risks
Testosterone gel is applied to the skin each day. Its most distinctive risk is transfer to others, so men should cover application sites and wash hands after applying.
Skin irritation, redness and acne at the application site are also common. Letting the gel dry fully before dressing helps reduce contact problems.
Serious Risks: Blood Clots, Cardiovascular Events and Prostate Changes
Some side effects need prompt medical care. The risks below are uncommon but important enough that every man on therapy should know the warning signs and what to do.
Blood clots and elevated red blood cell counts. Testosterone can raise red blood cell count and hemoglobin, which thickens the blood and raises clot risk. Clinicians commonly check a complete blood count (CBC) during therapy. Warning signs include swelling, pain, or warmth in one leg; sudden shortness of breath; chest pain; or coughing up blood. These are emergencies, call 911.
Cardiovascular events. Heart attack and stroke are rare but must be discussed, especially for men with existing heart disease, high blood pressure, diabetes, or abnormal cholesterol. The clinic's injectable treatment risks article shows how it approaches risks across injectable treatments. Symptoms include chest pain or pressure, pain radiating to the arm or jaw, sudden weakness or numbness on one side, trouble speaking, or sudden vision changes. Call 911 immediately; do not wait for a scheduled visit.
Prostate changes. Testosterone can affect prostate tissue ( the FDA). Men may notice weak urine flow, frequent nighttime urination, urgency, or pain while urinating. Clinicians may check prostate-specific antigen (PSA) when appropriate and refer for urology evaluation if symptoms persist. These symptoms should be checked promptly rather than watched for months.
Sleep apnea. Testosterone can worsen sleep apnea in some men. Snoring, witnessed pauses in breathing, morning headaches, or daytime sleepiness deserve a clinician's review; untreated apnea can affect heart rhythm and blood pressure.
Fertility effects. Testosterone therapy can lower sperm count and may shrink the testicles. Men who want children should raise this with a clinician before starting, since fertility can be affected during treatment.
Milder symptoms, new acne, mild mood shifts, or changes in urination, should still prompt a call to the clinician within a few days. A symptom diary makes those conversations more useful.
Monitoring that catches problems early. A monitoring schedule depends on age, health history, and delivery method, and is set by a clinician. Ask your clinician which tests to schedule, what hemoglobin or hematocrit level would call for a dose change, and how to report symptoms between visits.
Signs of Too Much Testosterone in Men and When to Seek Urgent Care
Too much testosterone can cause symptoms that should not be ignored. Men exploring the full range of hormone options can review the clinic's hormone replacement therapy overview. Watch for:
- Chest pain, shortness of breath or sudden weakness
- Leg pain or swelling in one leg
- Severe headache, confusion or trouble speaking
- Very heavy sweating, rapid heartbeat or agitation
- Persistent acne, aggressive behavior or major mood changes
Chest pain, one-sided weakness or trouble speaking are emergencies. Call 911 right away and do not wait for a scheduled visit.
Milder symptoms, such as new acne or mild mood shifts, should still prompt a call to the clinician within a few days.
Testosterone Therapy Monitoring: Tests and Schedule to Discuss With Your Clinician
Regular monitoring is how clinicians catch problems early. Common checks include testosterone levels, red blood cell count and hemoglobin, prostate-specific antigen (PSA) when appropriate, and cholesterol.
A typical plan includes labs a few months after starting and then periodically once the dose is stable. The hormone therapy follow-up guide explains how visits and lab checks are typically scheduled. The exact schedule depends on the man's age, health history and delivery method, so ask your clinician to set it.
Bring a list of symptoms and questions to each visit. Good records make it easier to adjust treatment safely.
Ask your clinician about:
- Which blood tests to schedule and how often
- What hemoglobin or hematocrit level calls for a dose change
- How to report symptoms between visits
Questions about treatment costs are best answered directly by the clinic. Contact Selah Aesthetics and Wellness for current pricing or a quote.
If you are considering treatment, book a consultation with Selah Aesthetics and Wellness to talk through your symptoms and risk factors before you start.
Frequently Asked Questions
What are the most common side effects of testosterone therapy in men?
The most frequently reported effects include acne, oily skin, mild fluid retention, breast tenderness, and changes in libido. Many of these are mild and may lessen as the dose is adjusted. Red blood cell count increases are also common and are checked with routine blood tests. Any new or worsening symptom should be reported to the prescribing clinician so the plan can be reviewed.
Can testosterone therapy affect fertility or sperm count?
Yes. Testosterone taken from outside the body can signal the brain to reduce its own hormone production, which may lower sperm count and reduce testicular size. Fertility can be affected during treatment and may take months to recover after stopping. Men who are planning a pregnancy with a partner should discuss fertility preservation options with their clinician before starting therapy.
How often should men be monitored while taking testosterone?
Monitoring usually includes blood tests for testosterone levels and hematocrit or hemoglobin, often within the first few months of starting and then periodically over time. Prostate-specific antigen and cholesterol may also be checked depending on age and health history. The exact schedule depends on the delivery method, dose, and individual risk factors, so it should be set by a licensed clinician.
Which testosterone therapy side effects need urgent medical attention?
Seek emergency care for chest pain, shortness of breath, sudden leg swelling or pain, slurred speech, weakness on one side of the body, or fainting. These can signal a blood clot, heart attack, or stroke. Severe difficulty urinating or blood in the urine also warrants prompt medical evaluation. Do not wait for a scheduled appointment if these symptoms appear.
Lauren Hodge, MSN, FNP-C, is a board-certified Family Nurse Practitioner and aesthetic injector in Columbus, GA, with advanced training in regenerative medicine and aesthetics. She combines her background in pediatrics, pain management, and orthopedics with a passion for natural results, helping patients look and feel their best.
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