Dr. Jonathan Leffert

Dr. Jonathan Leffert Jonathan Leffert, MD is a board certified endocrinologist.

He offers thyroid RFA, a nonsurgical and thyroid sparing treatment option for patients with thyroid nodules.

Do you have a persistent ringing, buzzing, or hissing in your ears that just won't go away? 🔊👂It might not be an ear pro...
01/16/2026

Do you have a persistent ringing, buzzing, or hissing in your ears that just won't go away? 🔊👂

It might not be an ear problem—it might be a thyroid problem.

For , we’re highlighting one of the most "invisible" symptoms of thyroid dysfunction: Tinnitus. While most people think of thyroid issues as weight or energy changes, your thyroid hormones are actually vital for the health of your auditory system.

The Thyroid-Ear Connection:
🦋 Hypothyroidism: When your metabolism slows down, it can affect the fluid balance in your inner ear, leading to ringing or even a "muffled" feeling in your hearing. 🦋 Hyperthyroidism: An overactive thyroid can increase blood flow and blood pressure, causing "pulsatile tinnitus"—where you can actually hear your heartbeat in your ears.
🦋 Autoimmune Factors: Conditions like Hashimoto’s or Graves’ disease are sometimes linked to inner ear inflammation.

If you’ve seen an ENT and everything looked "normal," it’s time to look at your thyroid labs. 🩺

Have you experienced ringing in your ears along with other thyroid symptoms? Tell us your story in the comments. 👇

If you’re on a journey to grow your family, there is one small gland you cannot afford to overlook: the thyroid. 🦋👶For ...
01/15/2026

If you’re on a journey to grow your family, there is one small gland you cannot afford to overlook: the thyroid. 🦋👶

For , I want to talk about why the thyroid is often the "missing piece" of the fertility puzzle. Every cell in the female reproductive system—from the ovaries to the uterine lining—has thyroid hormone receptors.

How your thyroid impacts fertility: ✨ Ovulation: Thyroid hormones are necessary for the release of an egg. Without enough, you may not ovulate at all (even if you’re having a regular cycle). ✨ Luteal Phase Support: An underactive thyroid can shorten the second half of your cycle, making it difficult for an embryo to implant. ✨ Miscarriage Risk: Thyroid antibodies and high TSH levels are often linked to an increased risk of early pregnancy loss.

If you’ve been told your "regular" labs are fine but you’re still struggling, it’s time for a deep dive into your endocrine health. 🩺

Have questions about hormones and fertility? Contact our office today! North Texas Endocrine Center 🌐 ntendocenter.com 📞 (214) 369-5992

Your thyroid is the "Master Conductor" of your cardiovascular system. 🦋🎻This , we’re looking at how thyroid function di...
01/15/2026

Your thyroid is the "Master Conductor" of your cardiovascular system. 🦋🎻

This , we’re looking at how thyroid function directly impacts your blood flow. Thyroid hormones aren't just for weight and hair; they are vital for "Vascular Resistance"—which is how hard your heart has to work to push blood through your body.

Low Thyroid (Hypothyroidism): Can lead to stiffened blood vessels and reduced blood volume. This is why many patients experience a "heavy" feeling in their legs or poor circulation. High Thyroid (Hyperthyroidism): Can cause the heart to pump too fast and too hard, which can actually lead to high blood pressure and an "overworked" vascular system.

A healthy thyroid means a healthy heart and efficient blood flow to every organ in your body. 🫀✨

If you have a history of circulation issues or blood pressure changes, a thorough thyroid panel is essential.

Are you looking for an experienced endocrinologist in the Dallas area? Contact our office today! North Texas Endocrine Center 🌐 ntendocenter.com 📞 (214) 369-5992

01/14/2026

Your endocrine system is a constant conversation. Today, I’m breaking down the most important "chat" in your body: The TSH Feedback Loop.

In this Reel, I explain:
✅ What TSH actually stands for (Thyroid Stimulating Hormone).
✅ Why your Pituitary gland is the "manager" of the system.
✅ What it means when your TSH and your symptoms don't seem to match.

Knowledge is power when it comes to your health. Save this post for the next time you get your blood work done! 💾

Are you looking for an experienced endocrinologist in the Dallas area?
Contact our office today!
North Texas Endocrine Center 🌐 ntendocenter.com 📞 (214) 369-5992

Are you feeling winded just walking up the stairs? It might not be your fitness level—it might be your thyroid. 🦋🫁For ,...
01/13/2026

Are you feeling winded just walking up the stairs? It might not be your fitness level—it might be your thyroid. 🦋🫁

For , we are looking at how this small, butterfly-shaped gland affects your lungs. Most people don't realize that thyroid hormones are essential for the strength of your respiratory muscles—including your diaphragm.

When your thyroid is out of balance: 💨 Hypothyroidism can lead to "shallow breathing" and weakened respiratory muscles, making you feel short of breath even with light activity. 💨 Hyperthyroidism can put your respiratory system into overdrive, leading to a rapid breathing rate and a feeling of "air hunger." 💨 Large Goiters or Nodules can physically press against the trachea (windpipe), making it difficult to breathe comfortably, especially when lying down.

Your thyroid is the "metabolic pace-setter" for every breath you take. If you’re struggling with unexplained shortness of breath, it’s time to look at your hormone levels. 🩺

Have you ever felt "out of breath" for no reason? Let’s talk about it in the comments. 👇

Constipated? Bloated? Feeling "sluggish" after every meal?It might not be your diet—it might be your thyroid. 🦋For , I’...
01/10/2026

Constipated? Bloated? Feeling "sluggish" after every meal?

It might not be your diet—it might be your thyroid. 🦋

For , I’m pulling back the curtain on the "Gut-Thyroid Connection." Your thyroid is the master controller of your metabolism, which acts like the engine for your digestive tract.

When your thyroid is slow (Hypothyroidism): 🐢 Your digestive "transit time" slows down. 🐢 This leads to chronic constipation and gas. 🐢 It can even lower stomach acid, making it harder to absorb nutrients from your food.

When your thyroid is overactive (Hyperthyroidism): 🏃‍♂️ Everything speeds up too much. 🏃‍♂️ This often leads to frequent bowel movements or malabsorption.

If your gut health hasn't improved with diet changes, it’s time to check your levels. Your digestion is often the first place a thyroid imbalance shows up!

Do you have questions about thyroid symptoms? Drop them in the comments below. 👇

When it comes to your thyroid, experience matters—but so does continuity of care. 🦋If you’ve been told you have a thyroi...
01/09/2026

When it comes to your thyroid, experience matters—but so does continuity of care. 🦋

If you’ve been told you have a thyroid nodule, the next steps can feel overwhelming. At North Texas Endocrine Center, Dr. Jonathan Leffert provides a seamless experience from start to finish.

As a board-certified endocrinologist with over 30 years of experience, Dr. Leffert doesn’t just manage your labs; he is hands-on with your diagnostic care. He performs his own ultrasounds and biopsies right here in the clinic, ensuring the highest level of accuracy and comfort.

Looking for a non-surgical option? Dr. Leffert also offers Thyroid Radiofrequency Ablation (RFA), a cutting-edge procedure that treats nodules without the need for surgery or a hospital stay.

Don't let a "wait and see" approach keep you in the dark. Get the expert answers you deserve.

Start your New Year with a team that puts your health first. Contact our office today! North Texas Endocrine Center 🌐 ntendocenter.com 📞 (214) 369-5992

It’s the first week of January, and the "crash diet" ads are everywhere. But as an endocrinologist, I see the side of th...
01/08/2026

It’s the first week of January, and the "crash diet" ads are everywhere. But as an endocrinologist, I see the side of these diets that the ads don’t show. 🛑

When we push our bodies into extreme calorie deficits or follow "fad" resolutions, we aren't just losing weight—we are sending a stress signal to our endocrine system.

Why crash diets often fail:
✨ Hormonal Backlash: Rapid restriction can cause a drop in active thyroid hormones and an increase in cortisol. ✨ Metabolic Adaptation: Your body learns to run on less, making it harder to maintain weight loss long-term.
✨ Muscle Loss: Without proper nutrition and medical oversight, you may lose vital muscle mass instead of just fat.

This year, let’s trade the "quick fix" for a "correct fix." Whether you are managing a thyroid condition, insulin resistance, or simply want to optimize your metabolic health, the best approach is one that is scientifically sound and sustainable.

Prioritize your hormones, fuel your body properly, and remember: health is a marathon, not a sprint. 🏃‍♂️💨

Start your New Year with a team that puts your health first. Contact our office today!

North Texas Endocrine Center 🌐 ntendocenter.com 📞 (214) 369-5992

01/07/2026

Getting to know Dr. Leffert. 👓🏛️

When he’s not caring for patients, Dr. Leffert is exploring Presidential Libraries across the country. He loves diving into the details of how these leaders lived, worked, and interacted with their families. It’s not about politics—it’s about the human stories that shaped our nation. 🇺🇸

Which Presidential Library should he visit next? Clinton in Little Rock or Carter in Atlanta? Vote below! 🗳️

01/05/2026

Are you taking control of your A1C? The power is in your hands!

Your A1C reflects your average blood sugar over the past few months. Taking consistent action is the key to better management.

Here are 4 essential steps to help you take control:

🥗 Follow a healthy eating plan.

🏃‍♀️ Stay physically active.

🩸 Monitor your blood sugar regularly.

📅 Remember your check-ups!

Ready to master your A1C goals? If you need support, we are here to help!

Happy Friday! It's always good to start off the new year with a refreshed perspective on health. One of the best and si...
01/02/2026

Happy Friday! It's always good to start off the new year with a refreshed perspective on health. One of the best and simplest ways to improve it is to focus on eating whole foods.

What is your top health priority or goal for the New Year? Let us know in the comments! 👇

The North Texas Endocrine Center office remains closed today, January 2nd, as we wrap up the New Year's holiday break. We are excited to kick off 2026 when we reopen for normal business hours on Monday, January 5th! We look forward to partnering with you on your goals!

01/01/2026

Happy New Year! Office Closure Notice.

The North Texas Endocrine Center will be closed for the holiday break on January 1st and 2nd.

We will resume normal hours on Monday, January 5th. We look forward to seeing you in the new year!

Address

NORTH TEXAS ENDOCRINE CENTER: Carrell Clinic Center, Tower II, 9301 North Central Expressway, Suite 570
Dallas, TX
75231

Opening Hours

Monday 8am - 4:30pm
Tuesday 8am - 4:30pm
Wednesday 8am - 4:30pm
Thursday 8am - 4:30pm
Friday 8am - 4:30pm

Telephone

+12143695992

Website

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