# Sierra Allergy Asthma and Sinus Center

> Board-certified allergy, asthma, and sinus clinic serving Fresno and Merced, California. Led by Dr. Muhammad Hassan Bashir, MD — Stanford-trained allergist with 15+ years of experience in allergy, asthma, immunology, and sinus care for pediatric and adult patients. Offers evidence-based diagnosis and personalized treatment across two Central Valley locations. Gold winner, Best Allergy Center — Best of Central California 2026 (https://www.bestofcentralcalifornia.com/listing/2026/allergy-center).

- Fresno Office: 7407 N Cedar Ave #102, Fresno, CA 93720 — (559) 369-4421
- Merced Office: 105 W El Portal Dr, Suite B, Merced, CA 95348 — (209) 349-8526
- Sitemap: https://sierraallergy.com/sitemap_index.xml

## Core Pages

- [Home](https://sierraallergy.com/)
- [About Us](https://sierraallergy.com/about-us/)
- [Contact Us](https://sierraallergy.com/contact-us/)

## Expertise — Conditions Treated

- [Seasonal Allergies](https://sierraallergy.com/seasonal-allergy-symptoms-treatment-in-fresno-merced/)
  - [Tree Pollen Allergy](https://sierraallergy.com/tree-pollen-allergy-treatment-in-fresno-and-merced/)
  - [Grass Allergy](https://sierraallergy.com/grass-allergy/)
  - [Weed Allergy](https://sierraallergy.com/weed-allergy/)
  - [Mold and Dust Allergy](https://sierraallergy.com/mold-and-dust-allergy/)
- [Asthma](https://sierraallergy.com/asthma-treatment-specialist-in-fresno-merced/)
  - [Exercise-Induced Asthma](https://sierraallergy.com/exercise-induced-asthma/)
  - [Occupational Asthma](https://sierraallergy.com/occupational-asthma/)
  - [Childhood Asthma](https://sierraallergy.com/childhood-asthma/)
- [Food Allergies](https://sierraallergy.com/food-allergy-management-with-food-allergist-in-fresno-merced/)
- [Chronic Cough](https://sierraallergy.com/chronic-cough-causes-symptoms-diagnosis-treatment-in-fresno-merced/)
- [Contact Dermatitis](https://sierraallergy.com/contact-dermatitis-symptoms-causes-treatment-in-fresno-merced/)
- [Drug Allergy](https://sierraallergy.com/drug-allergy-symptoms-treatment-care-in-fresno-merced/)
- [Eczema](https://sierraallergy.com/eczema-management-treatment-with-specialists-in-fresno-merced/)
- [Hives](https://sierraallergy.com/hives-causes-symptoms-management-options-in-fresno-merced/)
- [Stinging Insect Allergy](https://sierraallergy.com/stinging-insect-allergy-treatment-symptoms-in-fresno-merced/)
- [Immune Deficiency](https://sierraallergy.com/immune-deficiency-disorder-support-in-fresno-merced/)
- [Sinusitis](https://sierraallergy.com/sinusitis-infections-treatment-with-sinusitis-specialists/)
- [Vaccine Allergy](https://sierraallergy.com/vaccine-allergy-treatment-options-in-fresno-merced/)

## Testing

- [Environmental Allergy Skin Testing](https://sierraallergy.com/environmental-skin-allergy-testing-diagnosis-in-fresno-merced/)
- [Food Allergy Skin Testing](https://sierraallergy.com/food-allergy-skin-testing-methods-diagnosis-in-fresno-merced/)
- [Oral Food Challenges](https://sierraallergy.com/oral-food-allergy-challenge-testing-in-fresno-merced/)
- [Patch Testing](https://sierraallergy.com/patch-testing-procedure-skin-allergies-in-fresno-merced/)
- [Drug Testing & Challenges](https://sierraallergy.com/drug-testing-and-challenges-in-fresno-merced/)
- [Pulmonary Function (Spirometry)](https://sierraallergy.com/spirometry-procedure-pulmonary-testing-in-fresno-merced/)

## Treatment

- [Immunotherapy (Allergy Shots)](https://sierraallergy.com/immunotherapy-allergies-treatment-in-fresno-merced/)
- [Sublingual Immunotherapy (SLIT)](https://sierraallergy.com/sublingual-immunotherapy-slit-treatment-in-fresno-merced/)
- [Oral Food Desensitization](https://sierraallergy.com/oral-food-desensitization-treatment-therapy-in-fresno-merced/)

## Blog — Health Insights

- [How to Allergy-Proof Your Home Against Pollen](https://sierraallergy.com/how-to-allergy-proof-your-home-against-pollen/)
- [Quick Tips to Manage Your Child's Seasonal Allergies](https://sierraallergy.com/quick-tips-to-manage-your-childs-seasonal-allergies/)
- [All You Need to Know About Chronic Cough](https://sierraallergy.com/all-you-need-to-know-about-chronic-cough/)
- [How Seasonal Changes Can Trigger Your Allergies](https://sierraallergy.com/how-seasonal-changes-can-trigger-your-allergies/)
- [What to Do If You Are Stung by a Bee or Wasp](https://sierraallergy.com/what-to-do-if-you-are-stung-by-a-bee-or-wasp/)
- [How to Manage Asthma During Pregnancy](https://sierraallergy.com/how-to-manage-asthma-during-pregnancy/)
- [How to Manage Your Asthma in School Group Activities](https://sierraallergy.com/how-to-manage-your-asthma-in-school-group-activities/)
- [5 Ways to Manage Asthma Attacks at School Effectively](https://sierraallergy.com/5-ways-to-manage-asthma-attacks-at-school-effectively/)
- [6 Ways to Keep Your Asthma Under Control](https://sierraallergy.com/6-ways-to-keep-your-asthma-under-control/)
- [10 Tips & Tricks for Winter Allergy Relief](https://sierraallergy.com/10-tips-tricks-for-winter-allergy-relief/)
- [5 Natural Remedies for Allergy Relief](https://sierraallergy.com/5-natural-remedies-for-allergy-relief/)
- [How to Choose the Right Allergist for Food Allergy Testing](https://sierraallergy.com/how-to-choose-the-right-allergist-for-food-allergy-testing/)
- [Tips for Boosting Immunity and Body Defenses](https://sierraallergy.com/tips-for-boosting-immunity-and-body-defenses/)
- [10 Ways to Prepare for Spring Allergies](https://sierraallergy.com/10-ways-to-prepare-for-spring-allergies/)
- [10 Less Common Food Allergies to Look Out For](https://sierraallergy.com/10-less-common-food-allergies-to-look-out-for/)
- [Guide to Managing Severe Allergic Reactions to Insect Stings](https://sierraallergy.com/guide-to-managing-severe-allergic-reactions-to-insect-stings/)
- [Understand Peanut Allergies Inside and Out](https://sierraallergy.com/understand-peanut-allergies-inside-and-out/)
- [What Does an Allergist Do?](https://sierraallergy.com/what-does-an-allergist-do/)
- [How to Know If Your Child Has Allergies or Asthma](https://sierraallergy.com/how-to-know-if-your-child-has-allergies-or-asthma/)
- [Common Food Allergies and Their Symptoms](https://sierraallergy.com/common-food-allergies-and-their-symptoms/)
- [Where Can I Get Tested for Allergies?](https://sierraallergy.com/where-can-i-get-tested-for-allergies/)
- [How Long Does Contact Dermatitis Last?](https://sierraallergy.com/how-long-does-contact-dermatitis-last/)
- [Worst Fruits for Asthma: What You Should Avoid for Easier Breathing](https://sierraallergy.com/worst-fruits-for-asthma-avoid-for-easier-breathing/)
- [Low-Histamine Diet: What It Is, How It Works, and Who Really Needs It](https://sierraallergy.com/low-histamine-diet-what-it-is-how-it-works-and-who-really-needs-it/)
- [Are Air Purifiers Effective for Pollen-Related Allergies?](https://sierraallergy.com/are-air-purifiers-effective-for-pollen-related-allergies/)