Descending Pain: A New Way to Control Severe Chronic Pain

By Dr. Forest Tennant and Ingrid Hollis

The control of severe chronic pain in medical practice today is almost exclusively based on “ascending” or “neuropathic” pain:

Ascending pain occurs when a pain signal is transmitted from the site of injury or disease up the spinal cord to the brain. Neuropathic pain is the pain that results when there is damage or dysfunction of nerve tissue in the brain, spinal cord or peripheral nerves. 

In recent years, researchers discovered that when chronic pain centralizes, it creates a third type of pain called “descending” pain. This is a critical issue for persons with adhesive arachnoiditis and other diseases that cause severe chronic pain, because descending pain requires different medications than those used for ascending and neuropathic pain.

A person with constant pain will produce excess bioelectricity (central sensitization or centralized pain) in the glial cell matrix of the brain. This bioelectricity “descends” or travels down the spinal cord and vagus nerve. It not only produces pain, but over-stimulates the cardiovascular system. 

Descending pain is controlled by the noradrenergic receptor.  The neurotransmitter to this receptor is called noradrenalin or norepinephrine. 

Symptoms of Descending Pain

Descending pain will be present in persons who have constant, unremitting pain. Here are the symptoms:

• Pulse rate elevates

• Periodic hot flashes

• Cold hands/feet

• Excess sweating

• Allodynia (pain upon light touch) 

Over-Reliance on Opioids and Neuropathic Agents

The lack of awareness about descending pain is one reason why high doses of opioids and neuropathic agents (i.e., gabapentin, diazepam) may be over-prescribed. Physicians may simply raise the opioid or gabapentin dosage if they are not aware that the cause is descending pain.  What’s more, the increase in dosage may be ineffective or even harmful.

This also applies to opioids in implanted pumps.  Countless persons have been treated with an implanted device or “pain pump” with the erroneous belief that no medication, except intrathecal opioids, are needed.  Patients with these devices soon learn that their pain is poorly controlled by opioids alone. 

Opioids and neuropathic agents have little effect on descending pain.  It must be treated separately.

Pain treatment and relief are based on a medicinal that activates or stimulates a specific receptor (think “action point”) that is present in nerve cells in the brain, spinal cord or peripheral nervous system. Here is how the three types of pain and their receptors can be treated:

1. Ascending pain needs to be treated with medications that activate the endorphin or opioid receptor. 

2. Neuropathic pain control depends on activation of a receptor called gamma amino butyric acid (GABA). 

3. Descending pain control must activate the norepinephrine (noradrenalin) receptor.

To achieve good control of severe, chronic or intractable pain, all three of these receptors must be simultaneously activated.  Severe chronic pain is commonly undertreated, because all three receptors are not simultaneously activated.

Medication Classes for Descending Pain

Three medication classes are used to treat descending pain.  Medical practitioners and patients have choices, and can experiment to help decide which medications and supplements bring the most comfort.

1. Bioelectric Blockers: Tizanidine, propanolol, clonidine, tapentadol (Nucynta).

2. Receptor Activators: Modafanil (Provigil), methylphenidate (Ritalin), dextroamphetamine, amphetamine salts (Adderall), phentermine, lisdexamfetamine (Vynanse). Non-prescription activators: lion’s mane, mushroom extract, St. John’s wort, rhodiola, mucuna, whole adrenal gland.

3. Precursor (Amino Acids) of Noradrenaline: Phenylalanine at 1,000 to 2,000mg a day. Tyrosine at 1,000 to 2,000mg a day.

When not controlled, chronic pain, inflammation and autoimmunity will deplete a number of neurotransmitters and hormones.  When that happens, noradenaline (norepinephrine) will often be depleted. 

Supplements of either amino acids (phenylalanine or tyrosine) and daily protein intake may help reduce both background and flare pains. Phenylalanine and/or tyrosine need not be taken every day, but they are highly recommended at least two days a week. They can and should be taken with a bioelectric blocker or receptor activator.

Noradrenergic receptor activators do not raise pulse rate or blood pressure in a constant pain patient like they do in a normal person.  They may actually lower blood pressure and pulse rate.  That’s because chronic pain, inflammation and autoimmunity deplete noradrenalin.

One medication, tapentadol (Nucynta), is both an opioid and norandrenergic blocker. It is highly recommended.

Descending pain is a new discovery that must be recognized and controlled to achieve relief from severe chronic pain.  A sole reliance on opioid and neuropathic agents may often provide inadequate pain relief.

To learn more about descending, ascending and neuropathic pain, you can watch a recent episode of DocToks with Dr. Forest Tennant and Friends.

Forest Tennant, MD, DrPH, is retired from clinical practice but continues his research on the treatment of intractable pain and arachnoiditis. Readers interested in learning more about his research should visit the Tennant Foundation’s website, Arachnoiditis Hope. You can subscribe to its bulletins here.

Ingrid Hollis is a person in pain, patient advocate, and advisor to the Tennant Foundation.

The Tennant Foundation gives financial support to Pain News Network and sponsors PNN’s Patient Resources section.   

Intractable Pain Syndrome Has 2 Kinds of Pain

By Forest Tennant, PNN Columnist

A major reason that persons with Intractable Pain Syndrome (IPS) experience such misery is that when pain is the constant, 24/7 variety, it has two parts: ascending and descending pain. Both types need to be treated for relief.

Picture your body running on electric currents. In your house, electric currents are conducted by wire. Although there is no good reason to avoid the term “wire” when it comes to the human body, we usually refer to our biologic wires as nerves, nerve roots or neurons.

Unfortunately, any disease or injury to one or more of our “wires” blocks the electric currents that normally flow through the nerves, nerve roots or neurons, and diverts electricity into the surrounding tissue to produce inflammation and pain.

Ascending Pain is caused when pain electricity travels from the disease or injury site up the nervous system to the brain. This is the most common type of pain. For example, if you have a sore knee, pain signals travel from the knee to the brain.

Descending Pain is caused when severe pain from any number of diseases and injuries sends so much electricity into the brain and spinal cord that it accumulates. Areas of inflammation develop and destroy and/or damage the dopamine-noradrenaline neurotransmitter systems that control descending pain.

The excess electricity from these inflamed sites travels down the nervous system into muscles, skin, tendons, joints, fatty tissues, and the large and small peripheral nerves. Small nerve endings in the skin can “burn out” due to all the descending electricity and a skin biopsy will probably show small fiber neuropathy.

How do you know if you have descending pain? You have muscle aches all over which are often labeled as fibromyalgia. You hurt everywhere and experience episodes of overheating, sweating, and cold hands and feet, often at the same time!

Tips to Reduce Descending Pain

The critical point is that usual pain treatment only treats ascending pain, not descending pain. Opioids, antidepressants, anti-inflammatories and muscle relaxants do not usually do much for descending pain.

Each person with IPS must adopt a few simple but specific medical, physical, and dietary measures to attain some relief and recovery from both kinds of pain. You must maintain your dopamine-noradrenaline neurotransmitter systems daily, or you will have increased pain and misery, and believe that more drugs like opioids are the answer.

The understanding of blocked and diverted electric currents has led to the identification and labeling of a group of treatment agents that help normalize electric currents. These are known as neuropathic agents. The neurotransmitter most responsible for the proper conduction of electric currents is called gamma aminobutyric acid (GABA for short). It is synthesized by the body from the amino acid glutamine.

Neuropathic medications include gabapentin, pregabalin, carisoprodol, topiramate, duloxetine, and benzodiazepines.

In addition to neuropathic agents, there are simple “age-old” remedies that still work for most people because they help modulate electric currents so that they don’t divert, accumulate, and cause more inflammation and pain:

• Water Soaking

• Epsom or Herbal Salts

• Magnets

• Acupuncture

• Copper Jewelry

• Walking Barefoot

• Dry Needling

• Petting Fur

• Magnesium

Every person with IPS needs a daily program of neuropathic agents and age-old remedies to minimize the consequences of accumulated electricity.

Forest Tennant is retired from clinical practice but continues his groundbreaking research on intractable pain and arachnoiditis. This column is adapted from newsletters recently issued by the IPS Research and Education Project of the Tennant Foundation. Readers interested in subscribing to the newsletter can sign up by clicking here.

The Tennant Foundation has given financial support to Pain News Network and is currently sponsoring PNN’s Patient Resources section.