Hearing a hum, buzz or flutter that nobody else hears is common, and the sound usually comes from your own body rather than from anything around you. Your brain treats vibration felt through the skin and sound heard through the ear almost as the same signal, so the two can blend into one sensation.1Harvard Medical School. How Sound and Vibration Converge in the Brain to Enhance Sensory Experience The rhythm of the sound is often the best clue to its cause, and one rhythm, a beat that matches your pulse, should always be checked by a doctor.
Why a Sound Can Feel Like a Vibration
Sensors in your skin pick up fast vibrations from about 40 to 1,000 times per second.2PubMed Central. The auditory midbrain mediates tactile vibration sensing A region in the midbrain receives signals from both these touch sensors and the ear, and it responds more strongly when both arrive together.3PubMed Central. The auditory midbrain mediates tactile vibration sensing At the very lowest pitches, normal differences between people’s hearing mean some people experience the noise as vibration rather than as sound.4Undark Magazine. Why Do I Hear Vibrations? Causes and Solutions
You can feel a bass note in your chest at a concert or beside a loud speaker, even if you can’t pick out its pitch. When a sound is faint and very low, the ear’s signal is weak, and the brain may lean on any touch-like signal from the head or ear area.
Often the sound is tinnitus, which means hearing a sound that has no outside source. It is usually described as ringing, but it can also be a hum, a buzz or a sound like an electrical drone.
Your skull also carries sound to the inner ear, and it carries low pitches especially well.5Wikipedia. Bone conduction Sounds made inside your body, such as blood flow, muscle twitches and breathing, therefore reach you mainly as deep, rumbling vibration.
Quiet rooms make all of this worse. At night there is no background sound to cover a faint internal one, and lying on a pillow presses your ear and skull against it, which makes body sounds louder.
The Hum Only You Can Hear
People who hear a mysterious low hum often assume their hearing is unusually sensitive to low sounds.6American Academy of Audiology. The Hum When they were tested, only a few had better-than-average low-pitch hearing.7American Academy of Audiology. The Hum8bioRxiv. On the potential sources of a low-frequency sound percept only a few can perceive The most common explanation is low-pitched tinnitus, though a real outside source is sometimes the cause.9bioRxiv. On the potential sources of a low-frequency sound percept only a few can perceive
A few steps at home can show where the hum comes from:
- Move to another room, then another building, and notice whether the hum follows you.
- Plug your ears with earplugs. An outside sound gets fainter, while tinnitus often gets louder.
- Switch off the main power and appliances for a few minutes to rule out the fridge, pumps and transformers.
- Ask another person to listen at the same time and in the same place.
If the hum disappears when you leave the building, or stops when the power is off, an outside source is likely; switching circuits or appliances off one at a time can narrow it down. If it follows you everywhere and gets more noticeable with earplugs in, tinnitus is the likelier cause. Results can be mixed, since a real outside hum can seem to follow you if several places have similar machinery. Treat the test as a strong clue rather than proof.
One person failing to hear your hum doesn’t settle the question. A real outside hum can also be missed by other people, because some hear low pitches better than others and the sound may be louder in one spot, such as your bedroom.
If the hum is internal, a soft background sound such as a fan reduces how much you notice it. A hearing test can check for hearing loss, which often comes with tinnitus. Over months, the sound often fades from attention as your brain learns to ignore it.
A Whooshing Beat in Time With Your Pulse
Doctors call a sound that keeps time with your heartbeat pulsatile tinnitus, and it comes from blood moving in vessels near the ear. In one specialist group of patients with this sound, the most common causes were tumors with many blood vessels (16%), normal vein variations (14%) and narrowed vessels (9%).10PubMed Central. Pulsatile Tinnitus Some specialist clinics find instead that raised pressure around the brain, called idiopathic intracranial hypertension, is the most common cause.11PubMed Central. Pulsatile Tinnitus as the Primary Symptom in IIH: A Distinct Clinical Entity
In one group of patients with raised skull pressure, about 73% heard this heartbeat sound.12PubMed. Persistence of pulsatile tinnitus in patients with idiopathic intracranial hypertension following resolution of papilledema About 6 in 10 of them still heard it after the swelling at the back of the eye had cleared.13PubMed. Persistence of pulsatile tinnitus in patients with idiopathic intracranial hypertension following resolution of papilledema If you have been treated for raised skull pressure and still hear the beat, tell your doctor.
To check whether your sound is pulsing, feel your pulse at your wrist or neck while you listen. Notice whether the sound changes when you gently press the side of your neck. A beat on one side only is a strong reason to book an appointment.
People describe the sound as whooshing, thumping, or a heartbeat in the ear. It often becomes more obvious in bed because the ear rests against the pillow and the room is quiet. It can speed up after exercise or when you are anxious, because it follows your heart rate, which is a useful detail to tell a doctor.
A normal-looking cause can still be the answer. Some causes in the specialist group were normal variations in how veins are shaped or positioned, not disease, so the blood flow is simply noisy near the ear. Narrowed vessels create turbulent flow, much as water gets louder when forced through a narrow pipe. Abnormal links between arteries and veins let blood rush through at high speed, which can produce a loud sound. Only imaging and an exam can tell a harmless variation from one that needs treatment.
See a doctor soon if the beat comes with headaches, blurred vision or episodes of vision dimming. A sudden onset after a neck injury or with neck pain needs urgent care. Your doctor may order an MRI or CT scan of the blood vessels.
Clicks, Flutters and Your Own Breathing
Small muscles inside the middle ear can twitch in rhythmic bursts, which doctors call middle ear myoclonus and patients hear as a flutter or thumping. A muscle in the roof of the mouth opens the eustachian tube, the ear tube connecting the middle ear to the throat, and when it twitches it makes a repeated clicking sound.14PubMed Central. Palatal Tremor – Pathophysiology, Clinical Features, Investigations, Management and Future Challenges This palate muscle and one of the middle ear muscles are connected by a tendon and controlled by the same nerve, so the two problems may share a cause.15PubMed Central. Middle Ear Myoclonus: Two Informative Cases and a Systematic Discussion of Myogenic Tinnitus
Ear-muscle spasms are often described as fluttering, like a moth or a bird’s wings in the ear, or as a rapid thump or rumble. They can come and go, lasting seconds or minutes, and may happen in one ear or both. Palate-muscle clicking sounds like a fast, repeated tick or snap, and sometimes another person can hear it when standing close.
Unlike the heartbeat sound, a muscle flutter comes in irregular bursts that don’t follow your pulse. It can be set off by loud sounds, by touching your face or by yawning.
When the ear tube stays open, you hear your own voice and breathing loudly in your ear and the ear feels full.16PubMed. Autophony and the patulous eustachian tube The eardrum may move as you breathe in and out.17PubMed. Autophony and the patulous eustachian tube A roaring sound that follows your breathing points to this cause rather than to tinnitus. It often eases when you lie down or put your head between your knees.
Your own voice can sound booming inside your head. The sensation often comes and goes during the day, and may be worse after exercise or when you are dehydrated.
Noticeable weight loss is a common trigger for an open ear tube. Pregnancy and nasal decongestant sprays are linked to it, and sniffing hard to clear the ear can make it worse over time.
When the Vibration Is Really Around You
Very low-pitched noise from turbines, industry and data centers can disturb sleep and cause stress reactions, dizziness and ear symptoms even when it is too low to hear clearly.18Clean Technologies. Infrasound and Low-Frequency Noise in Data Center Environments: A Narrative Review Toward Health-Protective Acoustic Design Standards When loud noise and strong vibration came from nearby gas flares at one workplace, workers reported dizziness and ear pressure.19PubMed Central. Evaluation of Low-Frequency Noise, Infrasound, and Health Symptoms at an Administrative Building and Men’s Shelter: A Case Study
Standard sound meters weight their readings toward the pitches people hear best, so they largely miss this kind of noise.20Clean Technologies. Infrasound and Low-Frequency Noise in Data Center Environments: A Narrative Review Toward Health-Protective Acoustic Design Standards A hum that bothers you can register as quiet on a normal reading. A neighbor, landlord or inspector saying they measured nothing doesn’t prove there is no sound, and a measurement designed for low pitches is the right request. Low pitches also travel through walls and floors more easily than higher ones, so the sound can be more noticeable inside than outside.
To track down a source, keep a log of times and places, because outside sounds follow schedules. Check for nearby heat pumps, generators, pumps or factories. Neighbors who notice the same sound strongly suggest an outside cause, and local environmental health offices can measure low-pitched noise.
The sound may also be worse in one spot. Low-pitched sound can form standing patterns in a room, so it may be loud in one corner or by one wall and almost absent a few steps away. Sleeping in a different room for a night or two is a simple comparison that can show whether the place matters.
To reduce exposure, move your bed away from the wall nearest the source. Rubber mounts can stop appliance vibration from passing into the floor, and a fan or other masking sound helps with sleep.
Jaw, Neck, Stress and Medicines
The jaw joint and neck are the body areas that most often change tinnitus when they move or tense.21bioRxiv. Prevalence of somatosensory modulation of the cervical spine and temporomandibular joint in subjects with tinnitus: a systematic review If clenching, chewing or turning your head changes the sound, muscle tension may be involved. A dentist can check for teeth grinding and fit a night guard, and a physical therapist can treat neck stiffness.
Anxiety raises awareness of body sensations and tenses the muscles.22Daniel Cameron MD. Is Internal Vibration a Neurologic Problem or Anxiety? How to Tell the Difference During stress, that can produce a feeling of internal shaking or vibration.23Daniel Cameron MD. Is Internal Vibration a Neurologic Problem or Anxiety? How to Tell the Difference
Stopping an antidepressant, especially suddenly, can cause brief electric-feeling buzzes called brain zaps.24PubMed. Brain Zaps: An Underappreciated Symptom of Antidepressant Discontinuation They tend to start sooner after stopping drugs that leave the body quickly.25PubMed. Triggers and Characteristics of Brain Zaps According to the Findings of an Internet Questionnaire Tapering the dose gradually helps only partly,26PubMed. Brain Zaps: An Underappreciated Symptom of Antidepressant Discontinuation so plan any dose reduction with your prescriber rather than stopping on your own. People describe zaps as a brief electric jolt, often when they move their eyes. They usually fade over weeks. Restarting the antidepressant and tapering it more slowly is one option to discuss with your prescriber.
Coffee is often blamed for tinnitus, but in a long study of women, those who drank more caffeine were slightly less likely to develop it.27PubMed Central. A prospective study of caffeine intake and risk of incident tinnitus Cutting coffee is unlikely to cure a hum.
Treatments and When to See a Doctor
Ear-muscle spasms are usually treated first with calming or anti-seizure medicines, and Botox is another option.28PubMed. Middle ear myoclonus: Systematic review of results and complications for various treatment approaches Botox injected through the eardrum improved symptoms without complications in one group of patients.29PubMed Central. Efficacy and Safety of Intratympanic Botulinum Toxin Injection on Middle Ear Myoclonic Tinnitus In one reported case, Botox placed directly on the ear muscles stopped the symptoms completely and showed whether surgery would help.30PubMed. A Novel Technique for the Diagnosis and Management of Middle Ear Myoclonus If these fail, surgeons can cut the tiny tendons of the ear muscles.31PubMed. Middle ear myoclonus: Systematic review of results and complications for various treatment approaches
Botox weakens the muscle temporarily, so its effect fades over months and injections may need repeating. Surgery is kept for people whose symptoms continue and are bothersome.
For tinnitus, treatments that pair sounds with gentle touch, such as stimulation of the tongue or skin, are giving larger and longer-lasting benefits than sound alone in recent trials.32Frontiers in Audiology and Otology. Next-generation neuromodulation in tinnitus: multimodal approaches and deep targets Sound therapy and counseling also help many people notice tinnitus less.
Start with your family doctor or an ear, nose and throat doctor. The ear, nose and throat doctor examines the ear, can look at the eardrum for movement, and decides which tests are needed. An audiologist runs hearing tests, checks how the ear responds to sound, which may help sort tinnitus from other causes, and fits sound therapy devices. If a blood vessel cause is suspected, imaging is arranged, and a heartbeat sound may lead to a referral to a neurologist or a blood vessel specialist.
Before the appointment, write down whether the sound pulses, clicks, hums or follows your breathing. Note which ear it is in, when it happens, and what makes it better or worse. Bring a list of your medicines, including any you recently stopped.