Coastal Internal Medicine

Coastal Internal Medicine Fully Dedicated Internal Medicine Care to Guide You Through Your Journey to Health

True health isn’t just about quick fixes — it’s about building habits and care that last a lifetime. 💙At Coastal Interna...
01/09/2026

True health isn’t just about quick fixes — it’s about building habits and care that last a lifetime. 💙At Coastal Internal Medicine, we focus on long-term wellness, guiding you with personalized care, preventive strategies, and thoughtful solutions so you can live your healthiest, fullest life. 🩺

It’s Dr. O’Brien!! San Diego families love him! 💙For over 25 years, Dr. O has provided Vista and the surrounding commun...
01/07/2026

It’s Dr. O’Brien!! San Diego families love him! 💙
For over 25 years, Dr. O has provided Vista and the surrounding communities with outstanding, personalized care. He makes treatment options easy to understand and follows through with thoughtful guidance, helping every patient live their healthiest, fullest life.
Experience care that’s attentive, compassionate, and built around you. 🩺

01/05/2026

Looking for a personlized, holistic approach to your health with a doctor who builds real relationships with his patients and focuses on long term wellness and healthy lifestyle guidance? 🌞🌿 Come join Coastal Internal Medicine. 🩺

“I’m truly grateful to have found Dr. O’Brien as my primary care physician.” 💙From the very first visit, Dr. O’Brien mak...
01/02/2026

“I’m truly grateful to have found Dr. O’Brien as my primary care physician.” 💙
From the very first visit, Dr. O’Brien makes you feel seen, heard, and cared for. He takes the time for thorough exams, orders the right tests, and follows up personally to review results — that kind of attentiveness is rare.
At Coastal Internal Medicine, it’s not just about treating symptoms — it’s about building relationships and supporting you every step of the way. You can feel confident knowing your health is in good hands. 🩺

🎉 Happy New Year from Dr. O and the Coastal Internal Medicine team!Here’s to a healthy, happy, and strong year ahead. 💙
12/31/2025

🎉 Happy New Year from Dr. O and the Coastal Internal Medicine team!Here’s to a healthy, happy, and strong year ahead. 💙

12/29/2025

“I want a doctor that helps me build a healthier lifestyle, not just offer short-term fixes.”

At Coastal Internal Medicine, we hear that every day, and it’s exactly why we do what we do. Dr. O’Brien and our team take a personalized, comprehensive approach to your health, exploring every avenue to help you feel your best.

From preventive care and lifestyle guidance to chronic condition management, we’re here to support you for the long term, not just treat symptoms as they appear. With over 30 years of experience and thousands of patients served, we treat every patient like family — making sure your health journey is thorough, thoughtful, and sustainable.

This year, invest in your health with Coastal Internal Medicine — we’ll be in your corner every step of the way. 💙🩺

✨ Let’s make 2026 the year of healthy lifestyle changes and prosperity! ✨At Coastal Internal Medicine, we’re here to gui...
12/29/2025

✨ Let’s make 2026 the year of healthy lifestyle changes and prosperity! ✨
At Coastal Internal Medicine, we’re here to guide you every step of the way — from personalized care to comprehensive solutions for your health.
Come in and let us help you start the year strong! 💙🩺

Even at your desk, you can:✅ Stretch your neck, shoulders, and wrists✅ Do mini squats, calf raises, or leg lifts✅ Take s...
12/24/2025

Even at your desk, you can:
✅ Stretch your neck, shoulders, and wrists
✅ Do mini squats, calf raises, or leg lifts
✅ Take short walking breaks or climb a few stairs
Small movements add up — keep your energy, your posture, and your health on point.
Your body (and brain) will thank you!


This does not constitute medical advice as every patient is an individual and needs to have recommendations tailored specifically for them. Please consult your physician or make an appointment to see Dr. O’Brien at www.drmarkcobrien.com.

Thank you!

At Coastal Internal Medicine, your health comes first — always. 💙✅ Multiple Plans: We partner with a variety of insuranc...
12/22/2025

At Coastal Internal Medicine, your health comes first — always. 💙
✅ Multiple Plans: We partner with a variety of insurance providers to make care accessible and affordable.
✅ Fully Personalized Care: Every patient is unique — we help find solutions that fit your needs.
✅ Meticulous Care: Dr. O’Brien explores every avenue to ensure comprehensive, thorough care.
✅ 30+ Years of Experience: Thousands of patients have trusted us for over three decades.
✅ Patients Treated Like Family: Friendly, attentive, and dedicated to your complete health journey.

Looking for a new doctor? Make the move to Coastal Internal Medicine — your local practitioner with decades of experienc...
12/19/2025

Looking for a new doctor? Make the move to Coastal Internal Medicine — your local practitioner with decades of experience, same-day appointments, and visits that put you and your health first. 🩺
We’re here to help you understand, prevent, and take charge of your wellness.

12/17/2025

Your health shouldn’t wait. If something feels off, schedule an appointment. Same-day visits available. 🌞🌿

Ways to Support Your Health in San Diego 🌞🌿1. Soak in the morning sunlightStart your day with a coastal walk or balcony ...
12/15/2025

Ways to Support Your Health in San Diego 🌞🌿
1. Soak in the morning sunlight
Start your day with a coastal walk or balcony moment — morning sun helps regulate your circadian rhythm, boosts mood, and supports hormone balance.
2. Explore outdoor activities in North County
• Hike Torrey Pines for ocean views
• Walk the San Elijo Lagoon trails
• Paddleboard in Carlsbad Lagoon
• Stroll the Encinitas meditation gardens
• Bike the Oceanside coast trail
3. Move your body outside
San Diego’s weather is your biggest wellness advantage. Take workouts outdoors — beach yoga, coastal runs, or a simple long walk after dinner.
4. Prioritize hydration
The drier coastal air can sneak up on you. Keep water with you and replenish after time outside.
5. Eat fresh + local
Shop farmers markets (Encinitas, Leucadia, Carlsbad) for nutrient-dense, in-season foods that support energy, immunity, and digestion.

This does not constitute medical advice as every patient is an individual and needs to have recommendations tailored specifically for them. Pleaseconsult your physician or make an appointment to seeDr. O’Brien at www.drmarkcobrien.com.Thank you!

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161 Thunder Drive Suite 210
Vista, CA
92083

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