Fatigue and brain fog
Waking up tired, fading by mid-afternoon, and losing words mid-sentence despite sleeping enough.
Diamond Bar · San Gabriel Valley
Thyroid and hormone care that treats the whole person, not just a lab number
Dr. Hitendra H. Shah, MD has spent more than 40 years helping patients across the San Gabriel Valley understand why they feel unwell — and build a thyroid and hormone plan that finally works.
- 4.8 · 106 reviews
- 40+ years in practice
- 5,000+ patients treated
Led by
Dr. Hitendra H. Shah, MD
Board-certified physician · Thyroid & hormone specialist · Medical Director
4.8 · 106 reviews
- New Patients Welcome
- Free Consultations Available
- Free Parking
- Most Insurance Accepted
- Years in practice
- 40+
- Patients treated
- 5000+
- Average rating
- 4.8★
- Patient reviews
- 106
What brings patients in
Symptoms we help patients get to the bottom of
These are the complaints that bring most patients to the clinic — often after being told everything looked fine.
Unexplained weight gain
Weight that climbs, or refuses to move, even when eating and exercise have not changed.
Hair loss and thinning
Hair in the brush and drain, dry skin, and brittle nails — classic thyroid and nutrient signals.
Why patients choose us
A named specialist, not a rotating hospital group
40+ years in practice
Four decades of thyroid and hormone medicine, all delivered by the same physician who reads your labs.
5,000+ patients treated
Deep pattern recognition across thousands of thyroid cases, from routine hypothyroidism to complex autoimmune disease.
4.8 stars, 106 reviews
More patient reviews than any endocrinology practice within 15 miles of Diamond Bar.
Conditions treated
Thyroid and hormone conditions we treat
Every condition below is evaluated with a full panel and a full history — never a single TSH result.
Hashimoto's Thyroiditis
The most common autoimmune cause of low thyroid function — evaluated with antibody testing and attention to the immune drivers behind it.
Learn more
Hypothyroidism (Underactive Thyroid)
Persistent fatigue, weight gain, cold intolerance, and brain fog that lab-by-lab management alone has not resolved.
Learn more
Graves' Disease (Hyperthyroidism)
Autoimmune overactivity of the thyroid, including eye symptoms, managed with careful testing, monitoring, and coordinated care.
Learn more
Thyroid Nodules
Lumps, swelling, or an enlarged thyroid found on exam or imaging — evaluated for function and for whether further workup is needed.
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Hormone Imbalance
Hot flashes, sleep disruption, low libido, weight change, and mood shifts assessed alongside thyroid, adrenal, and metabolic health.
Learn more
Services
Care built around complete testing
Advanced Thyroid Testing & Evaluation
A complete panel — TSH, Free T3, Free T4, Reverse T3, and antibodies — not TSH alone.
Learn moreHormone Optimization & Imbalance Management
Targeted hormone assessment and a personalized plan for fatigue, mood, weight, and low energy.
Learn moreThyroid Medication Optimization
For patients who are treated with T4 alone and still do not feel well.
Learn moreWeight Management for Thyroid Health
Metabolic health, nutrient deficiencies, and thyroid treatment addressed together.
Learn moreHigh-Dose Vitamin D Therapy
A supervised vitamin D protocol within comprehensive thyroid and immune support.
Learn moreIntegrative Care & Ongoing Monitoring
Regular follow-up, medication refinement, and education that keeps treatment working.
Learn more7-Step Thyroid Rejuvenation Program
Dr. Shah's signature root-cause protocol for symptoms that persist despite normal labs.
Learn more
Our signature protocol
The 7-Step Thyroid Rejuvenation Program
Dr. Shah's comprehensive, root-cause protocol for patients whose thyroid symptoms persist despite “normal” labs or standard medication.
Step
01/ 07
Advanced, complete thyroid panel
- 01 · Advanced, complete thyroid panel
- 02 · Individualized lab interpretation
- 03 · Optimized thyroid medication
- 04 · Targeted nutrition
- 05 · Vitamin D and nutrient repletion
- 06 · Adrenal and gut support
- 07 · Stress and sleep restoration
Advanced, complete thyroid panel
TSH, Free T3, Free T4, Reverse T3, and thyroid antibodies — not a TSH test on its own.
Individualized lab interpretation
Your numbers are read against your symptoms and history, because normal is not always optimal.
Optimized thyroid medication
T4, combination T4 + T3, or natural desiccated thyroid when the clinical picture calls for it.
Targeted nutrition
An anti-inflammatory, thyroid-supportive eating plan built around your real routine.
Vitamin D and nutrient repletion
Correcting the deficiencies that commonly travel with thyroid and autoimmune disease.
Adrenal and gut support
Addressing the stress-response and digestive factors that influence thyroid hormone conversion.
Stress and sleep restoration
Practical sleep, stress, and recovery coaching, then rechecks to confirm progress.
The program is educational in nature and individualized at every visit. No outcome is guaranteed.
Meet your physician
Dr. Hitendra H. Shah, MD
- Board-certified physician
- Medical Director
- Thyroid & hormone specialist
- 40+ years
Dr. Shah is a board-certified physician and the Medical Director of Wellness Medical Clinic & Thyroid Treatment Center in Diamond Bar, California. He graduated from medical school in India and completed specialized training at Kings County Hospital in Brooklyn, New York, deepening his expertise in complex endocrine conditions.
He combines conventional medical science with integrative, whole-person medicine, and has successfully treated more than 5,000 patients over 40+ years. His difference is simple: he listens to your symptoms, not just your labs, and treats the whole body.
He does not order a TSH and stop. His initial workup includes a complete panel — Free T3, Reverse T3, Free T4, and thyroid antibodies — read against how you actually feel, because normal is not always optimal. When T4-only medication is not working, he will add T3 or natural desiccated thyroid and adjust until symptoms resolve.
Patient stories
What patients say after finally being heard
4.8 stars · 106 patient reviews
I finally feel like myself again. Dr. Shah gave me my life back.
Emily, a 42-year-old mother of three, had seen seven doctors in five years for hair loss, brain fog, fatigue, and weight gain. Every time, she was told her labs were normal.
Dr. Shah ran a complete thyroid panel and found low Free T3, high Reverse T3, and early signs of Hashimoto's thyroiditis.
This isn't just medical care — it's a transformation.
Jason, 38, developed fatigue, mental fog, and thinning hair. Doctors blamed stress and prescribed antidepressants.
A full thyroid and hormone panel revealed low Free T3, low testosterone, and adrenal fatigue.
Individual results may vary. Patient stories are shared for education and are not a promise of any particular outcome.
Service area
Serving Diamond Bar and nearby Los Angeles County cities
Thyroid care for Diamond Bar, CA
Home of the clinic, off the 57/60 interchange.
Thyroid care for Chino Hills, CA
About 10 minutes east along Grand Avenue.
Thyroid care for Walnut, CA
Minutes west via Valley Boulevard.
Thyroid care for Rowland Heights, CA
A short drive down Colima Road.
Thyroid care for Brea, CA
Just south over the hill on Brea Canyon Road.
Thyroid care for Pomona, CA
Northeast along the 60 Freeway.
Answers
Thyroid care in Diamond Bar: common questions
- What are the most common thyroid disorders?
- The most common thyroid disorders are hypothyroidism, hyperthyroidism, Hashimoto's thyroiditis, and Graves' disease. Each affects hormone production differently, causing fatigue, weight changes, anxiety, brain fog, or an irregular heart rate.
- What are the symptoms of hypothyroidism?
- Symptoms of hypothyroidism include fatigue, weight gain, dry skin, hair loss, constipation, depression, and feeling cold — and you can have these symptoms even when basic labs read “normal.”
- What is a complete thyroid blood test panel?
- A complete thyroid blood test panel includes TSH, Free T3, Free T4, Reverse T3, and thyroid antibodies. That is the full picture that basic TSH-only testing misses.
- Do I need T3 medication if T4-only treatment isn't working?
- Some patients do not feel better on T4-only medication such as levothyroxine. Combination T4 + T3 therapy or natural desiccated thyroid (NDT) may relieve symptoms when T4 alone has not.
- Can thyroid problems cause anxiety and depression?
- Yes. Both hypothyroidism and hyperthyroidism can cause anxiety, depression, or mood swings, because thyroid hormones help regulate brain function.
- Where is the Thyroid Treatment Center located?
- Wellness Medical Clinic & Thyroid Treatment Center is located at 23341 Golden Springs Dr, Unit 210, Diamond Bar, CA 91765, in Los Angeles County's San Gabriel Valley. The clinic serves patients from Diamond Bar, Chino Hills, Walnut, Rowland Heights, Brea, and Pomona.
- Who treats thyroid problems in Diamond Bar, California?
- Dr. Hitendra H. Shah, MD, a board-certified physician and thyroid and hormone specialist, treats thyroid conditions in Diamond Bar, California. He has more than 40 years in practice, has treated over 5,000 patients, and holds a 4.8-star rating across 106 patient reviews.
- My thyroid labs were called normal, but I still feel unwell. Can you help?
- Yes. Many patients come to the clinic after being told their TSH is normal. Dr. Shah reviews a complete panel — TSH, Free T3, Free T4, Reverse T3, and thyroid antibodies — alongside your symptoms and history rather than treating a single number in isolation.
Written and reviewed by Dr. Hitendra H. Shah, MD. Last updated: August 11, 2026.
Diamond Bar, California
Ready to get real answers about your thyroid?
Request an appointment with Dr. Shah and start with a full picture of your thyroid and hormone health.