SAN DIEGO (CBS 8) - From hot and humid, to rainy and cold, and now on the way back to more heat, the weather has been all over the place!

In addition to not knowing if you should wear your fall boots or flip flops on any given day, this weather has been driving people crazy in other ways too. Some people are convinced the weather is making them sick.

"This year has been about as schizophrenic as weather can possibly be," said Michael Moreno, MD.

If the sudden change in our weather is making you feel under the weather, you're not alone.

"Weather change can affect everybody's mood, and that we know, but it can also affect your overall health and wellness, not just mentally, but physically," said Moreno.

Dr. Michael Moreno, Medical Director of the Kaiser Permanente Positive Choice Wellness Center in San Diego, says changing weather patterns can take a toll on your body.

"Pressure changes have a big effect on joints, and have a big effect on how we feel overall," said Moreno.

Dr. Moreno says the weather itself can't actually make you sick, but it can cause changes in your body and activity level that weaken your immune system and make you more susceptible to germs and viruses.

"When it's cloudy or rainy, we tend to be less mobile, less active, and a little more depressed, seasonal affective disorder comes into play," said Moreno. Circulation, circulation circulation. The body lives and breathes on circulation. When you are healthy and moving, your organs are happy and are getting the oxygen they need. So is the immune system that is involved. They just work better."

Moreno also says that staying hydrated is just as important as exercising.

"Water is so key. The cells in our body, the skin, heart, lungs, kidneys, digestion, everything. The cells function through being hydrated," said Moreno.

In the end, perhaps the best way to stay healthy during the changing weather is something your mom has told you for years.

"Probably the number one thing you can do is wash your hands. People are going to say, when the weather changes I tend to get sick. I tend to think when the weather changes, maybe people are doing the things they are supposed to do, and then they get sick," said Moreno.

He says getting enough sleep is also important for keeping your immune system strong.

And for those of you with allergies, it's especially important to do all the right things because you are more susceptible to catching a cold or virus.