Los Gatos Office:
825 Pollard Road, Suite 100
Los Gatos, CA, 95032

Mountain View Office:
2490 Hospital Drive, Suite 103
Mountain View, CA 94040

New Membership Inquiries

Current Member Patients

Pollen, Grass, Ragweed and Mold spores

For more than 24 million Americans, the flowering trees and mild weather of spring and summer, signals another allergy season in full bloom. The cause: substances such as pollen, grass, ragweed and mold spores enter the body and are mistakenly identified as a threat by the immune system, triggering a variety of symptoms. We hope you find some comfort in this quick guide to seasonal allergies.

Reduce the effects of seasonal allergies

  • Pollen and spores can be carried into the home on your clothes or enter through windows during allergy season.
  • Know which pollens you are sensitive to and then check pollen counts. Weather reports often include this information during allergy seasons. In spring and summer, during tree and grass pollen season, levels are highest in the evening. In late summer and early fall, during ragweed pollen season, levels are highest in the morning. For an interactive map to view allergy levels and pollen count forecasts, visit pollen.com.
  • If your allergy symptoms are very bothersome:
    • Take a shower, wash your hair and change your clothes after you’ve been working or playing outdoors, and keep windows and doors shut at home and in your car.
    • Wear sunglasses and a hat outside to keep pollen out of eyes and hair. Your COVID-19 mask could provide a protective barrier against pollen.
    • Indoors, get an air purifier with a HEPA filter, and vacuum regularly.


Seasonal allergies are often treated with over-the-counter or prescription antihistamines (non-drowsy types are available), nasal steroid sprays, decongestants and immunotherapy (allergy shots that expose you over time to gradual increments of the allergen), as well as alternative methods. Please check with your healthcare provider to discuss what’s right for you.

table{background-color:transparent;border-collapse:collapse;font-family:Arial,Helvetica,sans-serif}th{text-align:left}.dcf-txt-center{text-align:center!important}.dcf-txt-left{text-align:left!important}.dcf-txt-right{text-align:right!important}.dcf-table caption{color:#242423;font-size:1.13em;font-weight:700;padding-bottom:.56rem}.dcf-table thead{font-size:1em}.dcf-table tbody{border-bottom:1px solid grey;border-top:1px solid grey;font-size:.9em}.dcf-table tfoot{font-size:.9em}.dcf-table td,.dcf-table th{padding-right:1.78em}.dcf-table-bordered,.dcf-table-bordered td,.dcf-table-bordered th{border:1px solid #e3e3e2}.dcf-table-bordered td,.dcf-table-bordered th,.dcf-table-striped td,.dcf-table-striped th{padding-left:1em;padding-right:1em}.dcf-table-bordered tr:not(:last-child),.dcf-table-striped tr:not(:last-child){border-bottom:1px solid #e3e3e2}.dcf-table-striped tbody tr:nth-of-type(2n){background-color:#f6f6f5}.dcf-table thead td,.dcf-table thead th{padding-bottom:.75em;vertical-align:bottom}.dcf-table tbody td,.dcf-table tbody th,.dcf-table tfoot td,.dcf-table tfoot th{padding-top:.75em;vertical-align:top}.dcf-table tbody td,.dcf-table tbody th{padding-bottom:.75em}.dcf-table-bordered thead th{padding-top:1.33em}.dcf-wrapper-table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;left:50%;margin-left:-50vw;margin-right:-50vw;padding-bottom:1em;position:relative;right:50%;width:100vw}@media only screen and (max-width:42.09em){.dcf-table-responsive thead{clip:rect(0 0 0 0);-webkit-clip-path:inset(50%);clip-path:inset(50%);height:1px;overflow:hidden;position:absolute;width:1px;white-space:nowrap}.dcf-table-responsive tr{display:block}.dcf-table-responsive td{-webkit-column-gap:3.16vw;-moz-column-gap:3.16vw;column-gap:3.16vw;display:grid;grid-template-columns:1fr 2fr;text-align:left!important}.dcf-table-responsive.dcf-table-bordered,.dcf-table-responsive.dcf-table-bordered thead th{border-width:0}.dcf-table-responsive.dcf-table-bordered tbody td{border-top-width:0}.dcf-table-responsive:not(.dcf-table-bordered) tbody tr{padding-bottom:.75em}.dcf-table-responsive:not(.dcf-table-bordered) tbody td{padding-bottom:0}.dcf-table-responsive:not(.dcf-table-bordered):not(.dcf-table-striped) tbody td{padding-right:0}.dcf-table-responsive.dcf-table-bordered tbody tr:last-child td:last-child{border-bottom-width:0}.dcf-table-responsive tbody td:before{content:attr(data-label);float:left;font-weight:700;padding-right:1.78em}}.dcf-overflow-x-auto{overflow-x:auto!important;-webkit-overflow-scrolling:touch}

Symptom Checker: Is It Allergies, a Cold or COVID-19?

Allergies Colds Covid-19
Duration of symptoms Allergy season 4-10 days Varies
Mucus Thin, watery and clear Thick and yellow/green
New loss of taste or smell Uncommon Uncommon Often (early)
Itchy or watery eyes Usually Rarely Rarely
Sneezing Usually Sometimes Rarely
Cough Frequent Usually Usually
Shortness of breath Sometimes allergens can exacerbate a respiratory condition Sometimes Usually
Sore throat Frequent Usually Usually
Fever Never Sometimes Usually
Diarrhea Never Uncommon Sometimes
Contagious Never Yes Yes
Body aches Never Sometimes Usually
Fatigue Sometimes Sometimes Usually

Not Your Imagination: Pollen Season May Be Getting Worse

According to the American College of Allergy, Asthma and Immunology (ACAAI), climate change has made pollen season longer and more severe throughout North America. A recent study showed that pollen seasons for plants like trees, grasses, and weeds showed a 20-day increase in length and a 21% increase in pollen concentration from 1990 to 2018. Notably the researchers also found that the pollen produced is more allergenic – more likely to trigger an allergic reaction with fewer grains of pollen in the air.
Sources: Mayo Clinic, ACAAI