Justin Bieber's new documentary series reveals the singer was diagnosed with Lyme disease, chronic mono, and anxiety.

"Justin fits the picture of the symptoms," Beverly Hills doctor Dr. Erica Lehman said in the documentary.

Lyme disease is often called the silent disease, in part because the bacterium that causes Lyme can be hard to detect in the bloodstream. Many celebrities have been accused of faking the illnesses.

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In the fifth episode of Justin Bieber's new YouTube docu-series, "Seasons," he speaks in detail for the first time about being diagnosed with chronic conditions, Lyme disease and Epstein Barr.

"It might not seem hard for some people to just get out of bed in the morning, but it's been really hard for me to just get out of my bed," Bieber told the camera.

The 25-year-old singer says he was diagnosed with Lyme last year after undergoing a series of tests with Dr. Erica Lehman, an eye doctor turned Lyme specialist who has treated other celebrities including Jordan Younger, a wellness influencer.

Lyme, a tick-borne disease, and Epstein Barr, also referred to as "mono," are both linked to extreme fatigue, chronic pain, and anxiety.

Bieber tells viewers it took years to diagnose as he also battled drug addiction and underlying anxiety that stemmed from the enormity of fame and an "inconsistent" upbringing.

Lyme disease is a tick-borne illness that can cause arthritis, facial palsy, and nerve pain if undetected

Bieber does not say how he believes he contracted Lyme disease, but he describes his symptoms, particularly extreme fatigue.

"I've been struggling with my energy for quite some time now, and I have not known why," Bieber said in the documentary. "I realized after a series of tests that I have what's called Lyme disease, which is a super silent disease that's not really well known. It's very hard for doctors to test for it."

Lyme disease is spread through the bite of infected ticks. It can be diagnosed if the tick is still in the person's skin, or was recently removed. If detected early, people can be treated with antibiotics, the only proven treatment for Lyme disease, according to the Mayo Clinic.

Juergen Faelchle/Shutterstock But tick bits are often hard to detect because they can bite people in difficult-to-see areas like armpits, the groin, and even the scalp, and though they often embed in the skin, they may not. Tick bites are also the size of a poppyseed, making the bites even harder to find. After being attached to a human for 36-to-48 hours, Lyme disease can be transmitted.

After a bite, most people will get a rash that looks like a bull's-eye, though some do not. That rash will often come with flu-like symptoms like fever and muscle pain.

There's been an uptick in cases of Lyme diseases, with the Centers for Disease Control and Prevention recently reporting 30,000 annual cases. More and more northeastern and upper midwestern United States are now classified as high-risk for this bacterial infection.

If Lyme isn't detected early, it can cause symptoms including arthritis, facial palsy, nerve pain, and heart palpitations.

The CDC says there is no proof that chronic Lyme disease is a real condition

Bella Hadid raised the profile of Lyme disease after revealing her diagnosis in 2012. Kevin Mazur/Getty Images Celebrities like Alec Baldwin, Avril Lavigne, Yolanda Hadid, Bella Hadid, and more claim to have chronic Lyme disease.

But critics, including the CDC, say there is no evidence that chronic Lyme disease exists, and they warn against giving a chronic Lyme diagnosis.

Although doctors say tick bites can lead to long-term symptoms, the CDC issued a report warning against using a chronic Lyme diagnosis as a reason to prescribe long-term antibiotics or IV infusions that can have adverse consequences.

Indeed, Bieber's doctor, Lehman, prescribed "around 30 supplements and began doing ozone therapy, a procedure in which blood is drawn, mixed with ozone, and then reinjected into the body" to another patient, YouTuber Jordan Younger, according to The Cut.

The ozone therapy made her feel worse, so Younger switched to umbilical stem cells injections, and Rocephin IVs three times a week.

Groups like the International Lyme and Associated Diseases Society say patients are suffering from the lack of proper diagnosis. On the other side, people argue that Lyme is the perfect disease for celebrities to fake; operating as a permanent reason to bow out of their responsibilities.

The bacterium that causes Lyme disease is difficult to detect in the bloodstream, so doctors often have to rely on symptoms

Borrelia burgdorferi, the bacterium that causes Lyme, is hard to detect in the bloodstream, meaning there are very little ways to prove someone does or doesn't have Lyme, beyond matching the symptoms they report to Lyme disease symptoms.

That seems to be what at least one of Bieber's doctors did.

"Lyme disease is the fastest growing bacterial infection in the United States right now," Lehman, one of the many medical professionals attending to Bieber, said in the documentary. "We know it can cause a whole spectrum of neuropsychiatric symptoms; mood changes, irritability, anxiety. Justin fits the picture of these symptoms."

Along with Lyme, Bieber received a diagnosis for Epstein Barr, or chronic mono

Most of us will get mono, a virus, at least once. But chronic mono is a rare, infectious disease. It comes with symptoms of severe fatigue, headaches, and fever, occurs when a person suffers from continuous illness and lingering symptoms, sometimes for years, according to the University of Minnesota's Mono Project. There is currently no cure.

Like Lyme, it is difficult to test for chronic mono, as some people can have continuous illness while others can have recurring illnesses, and some people will have some of the symptoms while others will all of the symptoms.

What's more, many of the symptoms of chronic mono are the same as the symptoms of Lyme disease.

Some research shows patients can have Lyme disease and chronic mono at the same time, even though both diseases have overlapping symptoms. Chronic anxiety, which Bieber also reported having, is a symptom of both diseases.

"It feels good to know now why I feel so crappy all the time," Bieber told the camera.

Read more:

Justin Bieber says he has Lyme disease and chronic mono affecting his 'skin, brain function, energy, and overall health'

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